Asking AI to explain Sunday observance when NT has no such command

[BNR32FAN]

First question to AI:

Using strict rules, “Is there any NT text that calls for weekly Sunday worship, or is the only explicit weekly pattern that of Sabbath preaching in Acts 18:4?”​

(AI confirms that there is no command to observe week-day-1 as a day of worshiip/rest etc)

Second Question to AI

Using strict rules, Given that we see not one new testament text saying that Sunday is the Lord’s day and not one text saying that the New Testament church met very Sunday for communion or for worship and not one statement that the term Sabbath is applied to Sunday, how do we get to the point today where the common view is that the new testament says Sunday is the Lord's day, they met every Sunday for gospel preaching and worship. ?​

Well I asked AI this question

According to the Bible are we still obligated to observe the Saturday Sabbath?

And this was the reply

Here is the clean, direct answer taken ONLY from Scripture itself — not from denominations, traditions, or opinions:
⭐
According to the Bible, Christians are not obligated to observe the Saturday Sabbath.

The New Testament speaks on this issue very clearly and repeatedly.
Below are the key passages — you can read each one in your own Bible to confirm.

1. Colossians 2:16–17 — “Do not let anyone judge you… about a Sabbath day.”

This is the strongest and most explicit verse in the entire Bible on this topic:

“Therefore let no one judge you in food or drink, or regarding a festival, or a new moon, or a Sabbath day, which are a shadow of things to come, but the reality is Christ.”
— Colossians 2:16–17

Paul says:

✔ Don’t let anyone judge you about Sabbath-keeping

✔ Sabbath was a shadow pointing to Christ

✔ The requirement is no longer binding

This is a direct statement that Sabbath observance is not required under the New Covenant.

2. Romans 14:5 — Christians do NOT have to treat any day as special

Paul writes:

“One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind.”

— Romans 14:5

If the Saturday Sabbath were still mandatory:

• Paul would never say “every day alike.”
• He would condemn those who don’t keep the 7th day.
• But he doesn’t.

Instead, he teaches freedom on the matter.

3. Acts 15 — The Apostles did NOT impose Sabbath on Gentile believers

At the Jerusalem Council, the apostles determined which Old Testament laws apply to Gentile Christians.

Here is the list:

“…abstain from food sacrificed to idols, from blood, from things strangled, and from sexual immorality.”

— Acts 15:19–20

Notice what’s NOT on the list:

❌ No Sabbath command
❌ No feasts
❌ No dietary laws
❌ No circumcision
❌ No Old Covenant rituals at all

If Sabbath were required, the apostles would have included it here. They didn’t.

4. Galatians 4:9–11 — Paul warns AGAINST going back to religious calendar law.

Paul rebukes the Galatians:

“You observe days, months, seasons, and years. I am afraid for you…”

— Galatians 4:10–11

What “days” is he talking about?

• Sabbaths
• Feast days

He says returning to calendar observances is going backwards — not required.

5. Hebrews 4 — The true Sabbath is fulfilled in Christ

Hebrews explains that the Sabbath pointed to something greater:

“There remains a Sabbath rest for the people of God… for the one who enters God’s rest has rested from his works.”


— Hebrews 4:9–10

This passage does NOT command keeping the 7th day.

Instead it teaches:

• Jesus is our rest
• The Sabbath was a symbol
• We enter God’s rest by faith

The Old Covenant Sabbath pointed to the salvation rest found in Christ.

6. The Sabbath command was part of the Old Covenant given to Israel, not Gentiles

The Bible says the Sabbath was: “a sign between Me and the children of Israel forever…”


— Exodus 31:16–17

Not humanity in general.
Not the Gentiles.
Not the nations.

Christians are under the New Covenant, not the Sinai Covenant.
⭐

So what does the Bible say overall?

❌ No New Testament command to keep the Saturday Sabbath
❌ No apostolic instruction requiring it
❌ No punishment for failing to keep it
❌ Repeated statements that Sabbath was a shadow
❌ Apostles warn against going back to Old Testament calendar laws
✔ Christians are free in Christ
✔ Worship can happen any day
✔ Jesus fulfills the meaning of Sabbath
✔ The early church met on Sunday voluntarily, not by command (Acts 20:7)
⭐
Final Biblical Conclusion

According to the Bible, Christians are not obligated to observe the Saturday Sabbath.

You can if you want — Romans 14:5 gives you that freedom.


But it is not commanded under the New Covenant.

If you want, I can also answer:

• Why some groups insist the Sabbath is still required
• What Jesus meant in Matthew 5:17 about not abolishing the Law
• Whether the Sabbath existed before Moses
• Whether Sunday worship “replaced” Sabbath (it didn’t — they’re different things)

Just tell me what angle you want to explore next.

 

[SabbathBlessings]

AI works better when asking it to look at Bible only. This was my results from the same question which matches my Bibles study on this verse I have been studying for years.


Great question — Colossians 2:16 is often cited in discussions about whether Christians are still required to keep the Sabbath commandment (the Fourth Commandment). Let's look at the verse carefully, in its full context, and then assess whether it refers to the weekly Sabbath from the Ten Commandments or ceremonial sabbaths in the Law of Moses.

---

Colossians 2:16–17 (NKJV)​

16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths,
17 which are a shadow of things to come, but the substance is of Christ.

---

Key Questions:​

1. What kind of “sabbaths” is Paul talking about?​

Let’s break the phrase down:

“festival, new moon, or sabbaths”

This phrase appears in many places in the Old Testament, often in this same order, and always refers to ceremonial observances:

• 1 Chronicles 23:31
• 2 Chronicles 2:4
• 2 Chronicles 31:3
• Nehemiah 10:33
• Ezekiel 45:17
• Hosea 2:11

These texts link festivals, new moons, and sabbaths as ceremonial observances — part of the Mosaic (Levitical) system, not the weekly seventh-day Sabbath of the Ten Commandments.


That’s why Paul says in Col. 2:17:

"which are a shadow of things to come, but the substance is of Christ."

In other words, these ceremonial laws pointed forward to Christ and found their fulfillment in Him.

---

2. Is the weekly Sabbath also a shadow?​

There’s a strong distinction between:

Type of Law	Description	Shadow of Christ?	Abolished in Christ?
Moral Law (10 Commandments)	Eternal moral principles (Ex. 20)	❌ No	❌ No
Ceremonial Law	Feasts, sacrifices, rituals, sabbaths tied to festivals (Lev. 23)	✅ Yes	✅ Yes

• The weekly Sabbathwas:
  • Given at Creation (Genesis 2:2–3)
  • Reinforced in the Ten Commandments (Exodus 20:8–11)
  • Not instituted as a shadow, but as a memorial of creation
• The ceremonial sabbaths(e.g., Day of Atonement, Feast of Trumpets) are:
  • Called sabbaths too (see Leviticus 23)
  • Fall on various days, not necessarily the seventh day
  • Shadows pointing to Jesus' work

Therefore, when Paul talks about “sabbaths which are a shadow”, he refers to these ceremonial sabbaths, not the weekly Sabbath of the Fourth Commandment.

---

3. Did Jesus or the Apostles abolish the weekly Sabbath?​

• Jesus kept the Sabbath (Luke 4:16)
• The disciples kept the Sabbath after Jesus' death (Acts 13:42, 16:13, 17:2, 18:4)
• Hebrews 4:9 says:
  

  "There remains therefore a Sabbath rest [Greek: sabbatismos] for the people of God."

---

✅ Conclusion:​

Colossians 2:16 does not cancel the weekly Sabbath commandment.
It refers to ceremonial sabbaths, along with food and drink offerings, and religious festivals that were shadows pointing to Christ.


The Fourth Commandment Sabbath is not a shadow, but a memorial of creation and a sign of God’s sanctifying work (Exodus 31:13, Ezekiel 20:12).

2. But Which Commandment Does God Emphasize Most in the Bible?​

✅ The Fourth Commandment (Sabbath) is the only one God:​

• Calls "My holy day" (Isaiah 58:13)
• Links to Creation (Genesis 2:1–3; Exodus 20:11)
• Uses to test Israel's obedience before Sinai (Exodus 16)
• Commands to remember as a sign between Him and His people (Ezekiel 20:12, 20)
• Institutes as a covenantal sign (Exodus 31:13–17)

The Fourth Commandment is the most directly spoken about by God throughout the Bible. It is personally claimed by Him, reaffirmed repeatedly, and tied to His identity as both Creator and Sanctifier.

 

[BobRyan]

Honestly, this whole argument assumes the NT was supposed to give us a new version of Leviticus. It doesn’t.

I don't argue that at all.

There’s no command for Sunday, yeah

So then the question is how did we get to the state today where many people suppose that the first century church taught Christians that they need to have Sunday services, ignore one of the Ten Commandments (exactly 1), etc.

—but there’s also no command for Christians to keep the Sabbath

And no command to not take God's name in vain in the NT either.

Thankfully all major Christian denominations today ignore that kind of solution

No command of the form "Whatever is not repeated should be deleted"
No command to keep Sunday Holy
No statement saying "Sunday is the Lord's day" or "week day one is the Lord's day"

But we do have "Sabbath..the Holy Day of the Lord" Isaiah 58:13
And we have Jesus "is Lord of the Sabbath" Mark 2:28

Acts 18:4 isn’t Christians “keeping Sabbath”—it’s Paul preaching to Jews in a synagogue.

If you ignore enough details in Acts 18 you could get to that point.

But in actual scripture it is "every Sabbath
' gospel preaching to both gentiles and Jews INSTEAD of the much imagined "Tell them on Sabbath and then start attending on Sunday for more Gospel teaching".

In fact in Acts 13 they hear the gospel on Sabbath and then ask for more gospel teaching to be scheduled for "THE NEXT Sabbath"

So pointing out “there’s no Sunday command” doesn’t prove Sabbath is binding, it just proves the NT isn’t a rulebook for weekly holy days.

NT quoting from the TEN "He who breaks one , breaks them all" James 2
NT demanding that we pay attention to ALL of Gods commandments "What matters is KEEPING God's Commandments" 1 Cor 7:`9

NT stating "The saints kEEP the Commandments of GOD AND their faith in Jesus: Rev 14:12

==========================

So how is all this getting your desired answer to the OP?? Seems to be going the opposite direction

Well I asked AI this question

According to the Bible are we still obligated to observe the Saturday Sabbath?

And this was the reply

Here is the clean, direct answer taken ONLY from Scripture itself — not from denominations, traditions, or opinions:
⭐
According to the Bible, Christians are not obligated to observe the Saturday Sabbath.

The New Testament speaks on this issue very clearly and repeatedly.
Below are the key passages — you can read each one in your own Bible to confirm.

1. Colossians 2:16–17 — “Do not let anyone judge you… about a Sabbath day.”

This is the strongest and most explicit verse in the entire Bible on this topic:

“Therefore let no one judge you in food or drink, or regarding a festival, or a new moon, or a Sabbath day, which are a shadow of things to come, but the reality is Christ.”
— Colossians 2:16–17

Paul says:

✔ Don’t let anyone judge you about Sabbath-keeping

✔ Sabbath was a shadow pointing to Christ

✔ The requirement is no longer binding

This is a direct statement that Sabbath observance is not required under the New Covenant.

2. Romans 14:5 — Christians do NOT have to treat any day as special

Paul writes:

“One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind.”

— Romans 14:5

If the Saturday Sabbath were still mandatory:

• Paul would never say “every day alike.”
• He would condemn those who don’t keep the 7th day.
• But he doesn’t.

Instead, he teaches freedom on the matter.

3. Acts 15 — The Apostles did NOT impose Sabbath on Gentile believers

At the Jerusalem Council, the apostles determined which Old Testament laws apply to Gentile Christians.

Here is the list:

“…abstain from food sacrificed to idols, from blood, from things strangled, and from sexual immorality.”

— Acts 15:19–20

Notice what’s NOT on the list:

❌ No Sabbath command
❌ No feasts
❌ No dietary laws
❌ No circumcision
❌ No Old Covenant rituals at all

If Sabbath were required, the apostles would have included it here. They didn’t.

4. Galatians 4:9–11 — Paul warns AGAINST going back to religious calendar law.

Paul rebukes the Galatians:

“You observe days, months, seasons, and years. I am afraid for you…”

— Galatians 4:10–11

What “days” is he talking about?

• Sabbaths
• Feast days

He says returning to calendar observances is going backwards — not required.

5. Hebrews 4 — The true Sabbath is fulfilled in Christ

Hebrews explains that the Sabbath pointed to something greater:

“There remains a Sabbath rest for the people of God… for the one who enters God’s rest has rested from his works.”


— Hebrews 4:9–10

This passage does NOT command keeping the 7th day.

Instead it teaches:

• Jesus is our rest
• The Sabbath was a symbol
• We enter God’s rest by faith

The Old Covenant Sabbath pointed to the salvation rest found in Christ.

6. The Sabbath command was part of the Old Covenant given to Israel, not Gentiles

The Bible says the Sabbath was: “a sign between Me and the children of Israel forever…”


— Exodus 31:16–17

Not humanity in general.
Not the Gentiles.
Not the nations.

Christians are under the New Covenant, not the Sinai Covenant.
⭐

So what does the Bible say overall?

❌ No New Testament command to keep the Saturday Sabbath
❌ No apostolic instruction requiring it
❌ No punishment for failing to keep it
❌ Repeated statements that Sabbath was a shadow
❌ Apostles warn against going back to Old Testament calendar laws
✔ Christians are free in Christ
✔ Worship can happen any day
✔ Jesus fulfills the meaning of Sabbath
✔ The early church met on Sunday voluntarily, not by command (Acts 20:7)
⭐
Final Biblical Conclusion

According to the Bible, Christians are not obligated to observe the Saturday Sabbath.

You can if you want — Romans 14:5 gives you that freedom.


But it is not commanded under the New Covenant.

If you want, I can also answer:

• Why some groups insist the Sabbath is still required
• What Jesus meant in Matthew 5:17 about not abolishing the Law
• Whether the Sabbath existed before Moses
• Whether Sunday worship “replaced” Sabbath (it didn’t — they’re different things)

Just tell me what angle you want to explore next.

ASK AI:

Q: Who changed the Sabbath to Sunday?

A: Emperor Constantine
"The change of the Sabbath from Saturday to Sunday is primarily attributed to Emperor Constantine, who declared Sunday a day of rest in 321 CE. Additionally, the Council of Laodicea in 363 A.D. also played a role in this transition by officially deciding that the Sabbath should be observed on Sunday."

Even so

Almost every Christian denomination on Earth affirms the continued *"unit of TEN" for Christians today
[*]The Baptist Confession of Faith section 19
[*]The Westminster Confession of Faith section 19
[*]Voddie Baucham
[*]C.H. Spurgeon
[*]D.L. Moody
[*]Dies Domini by Pope John Paul II
[*]D. James Kennedy
[*]R.C. Sproul
[*]many others as well..

 

[BobRyan]

Then AI gave this "Biblical Context" remark

Biblical Context​

• The Sabbath was established by God at creation (Genesis 2:2–3) and is explicitly commanded as the seventh day, Saturday, in the Ten Commandments (Exodus 20:8–11; Deuteronomy 5:12–15).
• Jesus Christ observed the Sabbath and taught that the Law, including the Sabbath, remains valid (Matthew 5:17–19; Luke 4:16).
• The apostles and early Christians continued to observe the seventh-day Sabbath. The New Testament contains numerous references to Sabbath observance, with no divine instruction to shift it to Sunday (Acts 16:13, 17:2, Hebrews 4:4, 9).

Early Historical Developments​

• In the 2nd century, Christian writers such as Justin Martyr and Clement of Alexandria began promoting Sunday as a commemoration of Christ’s resurrection. This was initially a supplemental practice, not a replacement of the Sabbath.
• Anti-Jewish sentiment and cultural influences gradually encouraged some Christians to distance themselves from Saturday worship.

1. Ecclesiastical Formalization​

   • The Council of Laodicea (~364 CE) reinforced Sunday observance and discouraged Sabbath observance among Christians:
     

     “Christians must not Judaize by resting on the Sabbath, but must work on that day, rather honor the Lord’s Day.”

   • Subsequently, the Catholic Church, under Popes such as Sylvester I and with bishops like Eusebius, formalized the practice of Sunday observance as the “Lord’s Day,” transferring rest from Saturday to Sunday.

2. Summary of Contributors​

   1. Jesus and Apostles – Maintained Saturday Sabbath; no divine instruction to change it.

 

[DamianWarS]

Q: Who changed the Sabbath to Sunday?

this is a loaded question. The Sabbath is not Sunday. Sunday is not the Sabbath (so please stop presenting it this way). if you ask AI that question, it's going to give you an answer based on your prompting (which has a bias) and give you a bunch of information of how history records events that are consistent with the language you used.

Where there are historical claims that Sunday is the new sabbath, we need to approach those claims critically, just as we need to approach claims on whether keeping Sabbath law is still a value in Christian living also critically. I see questions like this framed in a sort of strawman approach with the goal of discrediting the value of gathering on Sunday, which really has nothing to do with the issue. The greater question is whether keeping Sabbath law is a requirement in Christian living nor if Sunday is better. if that answer is a yes, then the value for any other day is a moot point and settled immediately. If that answer is a no, then we may start to discuss values for other days, and if they too have a requirement or if the very notion of a requirement itself is counter-gospel. But NT teaching doesn't establish a commandment for any day to meet on the 7th or the 1st and it would be futile to argue this point. Of course, we see establishing customs in the NT for both the 7th day and the 1st day teaching/gathering but neither establishes these as commandments. If Rev 1:10 points to the Sabbath or to Sunday, it also doesn't establish this. These are reported matter-of-factly without embedded moral implications or commandments.

Using the NT to preach a 10 commandment system is counter-gospel and requires inserting that idea into the text. Hebrews 8:13 settles the matter, saying the old covenant has been made obsolete. the 10 are this old covenant, Deut 4:12 explicitly tells us this. Read all of chapters 4 and 5, These events of the 10 being proclaimed at the foot of the mountain through blazing fire and lightning, as Deut 4/5 tells us, are recorded in Exodus 20. This is before the tablets, and many laws follow this, Ex 24 (still before the tabelts) is a blood covenant that includes the 10 but also all these other commandments explicitly told from the mouth of God, this is the formal covenant agreement first established. This covenant was reestablished after the golden calf event with new tablets, but it's not a different covenant. the bible never bifurcates law, torah or this covenant. There is only one, not multiple competing covenants, and the bible teaches this covenant has been made obsolete (Heb 8:13)

 

[BNR32FAN]

I don't argue that at all.

So then the question is how did we get to the state today where many people suppose that the first century church taught Christians that they need to have Sunday services, ignore one of the Ten Commandments (exactly 1), etc.

And no command to not take God's name in vain in the NT either.

Thankfully all major Christian denominations today ignore that kind of solution

No command of the form "Whatever is not repeated should be deleted"
No command to keep Sunday Holy
No statement saying "Sunday is the Lord's day" or "week day one is the Lord's day"

But we do have "Sabbath..the Holy Day of the Lord" Isaiah 58:13
And we have Jesus "is Lord of the Sabbath" Mark 2:28



If you ignore enough details in Acts 18 you could get to that point.

But in actual scripture it is "every Sabbath
' gospel preaching to both gentiles and Jews INSTEAD of the much imagined "Tell them on Sabbath and then start attending on Sunday for more Gospel teaching".

In fact in Acts 13 they hear the gospel on Sabbath and then ask for more gospel teaching to be scheduled for "THE NEXT Sabbath"

NT quoting from the TEN "He who breaks one , breaks them all" James 2
NT demanding that we pay attention to ALL of Gods commandments "What matters is KEEPING God's Commandments" 1 Cor 7:`9

NT stating "The saints kEEP the Commandments of GOD AND their faith in Jesus: Rev 14:12

==========================

So how is all this getting your desired answer to the OP?? Seems to be going the opposite direction

ASK AI:

Q: Who changed the Sabbath to Sunday?

A: Emperor Constantine
"The change of the Sabbath from Saturday to Sunday is primarily attributed to Emperor Constantine, who declared Sunday a day of rest in 321 CE. Additionally, the Council of Laodicea in 363 A.D. also played a role in this transition by officially deciding that the Sabbath should be observed on Sunday."

Even so

Almost every Christian denomination on Earth affirms the continued *"unit of TEN" for Christians today
[*]The Baptist Confession of Faith section 19
[*]The Westminster Confession of Faith section 19
[*]Voddie Baucham
[*]C.H. Spurgeon
[*]D.L. Moody
[*]Dies Domini by Pope John Paul II
[*]D. James Kennedy
[*]R.C. Sproul
[*]many others as well..

Actually my point was that AI doesn’t interpret scripture constantly.

 

[BobRyan]

Actually my point was that AI doesn’t interpret scripture constantly.

true. but it can look up texts

 

[BobRyan]

Fresh session window.

Q: using strict rules according to the Bible who changed the Sabbath from Saturday to Sunday
AI response: According to the Bible itself, no one ever changed the Sabbath from Saturday to Sunday.


Q: According to the Bible were gentiles who heard the gospel in Acts 13 asking for more gospel preaching to be scheduled for them the next Sabbath
A: Yes — according to the Bible, the Gentiles in Acts 13 did ask for more gospel preaching to be scheduled for the next Sabbath.


Q: According to Acts 18:4 was Paul preaching the Gospel “every Sabbath” to both gentiles in Jews in a worship service
A: Yes — according to Acts 18:4, Paul was preaching the gospel every Sabbath to both Jews and Gentiles in a synagogue setting.

Q: Based on your responses did the New Testament church continue to keep Sabbath on Saturday after the cross
A: Yes — based on the New Testament record, the early church did continue to keep the Sabbath on Saturday after the cross.

Conclusion
According to the New Testament itself, the early church continued to keep the Sabbath on Saturday after the cross,
Conclusion

According to the New Testament itself, the early church continued to keep the Sabbath on Saturday after the cross,

==================== end AI response

 

[BobRyan]

.Conclusion

• 1 Corinthians 16:2 is not describing a Sunday worship gathering. It is Paul’s instruction for each believer to privately set aside money at home on the first day of the week, so that when he came, the collection would already be prepared.

==
Q: is there a meeting described in 1 Cor 16 for week day 1
A: No

Q: So then it would be incorrect to list 1 Cor 16 as an example of gathering on the first day of the week for worship or to remember the resurrection

A: That’s correct — it would be incorrect to use 1 Corinthians 16:2 as an example of believers gathering for worship or to commemorate the resurrection on the first day of the week.

Why?

• The Greek wording “par’ heautō” (translated “lay by him in store”) means each person privately, by himself, at home.
• Paul’s instruction was about setting aside money individually so that when he arrived, the collection would already be prepared.
• There is no mention of a worship service, communal gathering, or resurrection remembrance in this passage.

• “Lay by him in store” — The Greek phrase (par’ heautō) literally means “by himself” or “at home.”
  • This suggests Paul was instructing each believer to set aside money privately, not to bring it to a public meeting.
• Purpose: Paul wanted the funds ready when he arrived, so there would be no need for hurried collections.
• Not a Worship Gathering: The verse does not describe a church service or communal worship on Sunday. It is about personal preparation for a future offering.
• Contrast with Acts 20:7: That passage does describe believers gathering on the first day of the week. But 1 Corinthians 16:2 is about individual action, not a meeting.

Q: so then you have exactly one example of gathering on the first day of the week for communion and it was the special occassion of a farewell event as Paul was leaving the next day. There is no record of the Acts 20 gathering being held on the Lord's Day. Since this is the one and only record of a service held on Sunday ,and no text says that the first day is the Lord's day, and they continued worship services on Sabbzth Saturday, does scripture say they met weekly on Sunday for worship

A: You’ve summarized the evidence very well — and the answer is no, Scripture does not say that the New Testament church met weekly on Sunday for worship.

What the Bible Records

• Sabbath (Saturday) gatherings:
  • Acts 13:42–44 — Gentiles asked Paul to preach again the next Sabbath.
  • Acts 16:13 — Paul went to a place of prayer on the Sabbath.
  • Acts 17:2 — Paul reasoned in the synagogue for three Sabbaths.
  • Acts 18:4 — Paul preached every Sabbath to Jews and Gentiles.
• First day of the week (Sunday):
  • Acts 20:7 — One special farewell meeting where Paul preached late into the night before departing.
  • 1 Corinthians 16:2 — Instruction for believers to set aside money privately at home on the first day, not a worship service.

Key Observations

• Only one recorded Sunday gathering (Acts 20:7): And it was a unique farewell occasion, not a regular weekly service.
• No text calls Sunday “the Lord’s Day”: The New Testament never equates the “first day of the week” with “the Lord’s Day.”
• No command to change the Sabbath: The Bible consistently identifies the Sabbath as the seventh day, and there is no passage that institutes Sunday as a weekly day of worship.
• Pattern of worship: The consistent pattern in Acts is Sabbath observance and preaching, even among Gentiles.

✅ Conclusion

Scripture shows continued Sabbath worship after the cross and records one special Sunday meeting, but it does not say the church met weekly on Sunday for worship. The idea of Sunday as a regular day of worship developed later in church history, not from the New Testament itself.