Jeremiah 31:31-34 is in the time of the Millennium unless you think that everyone today knows the Lord (See: Jeremiah 31:34).
As for the least of these commandments mentioned by our Lord Jesus in Matthew 5:19:
Pay attention to what Jesus said closely. Jesus was teaching New Covenant and not Old Covenant at the sermon on the Mount. Jesus was making changes to the Law at the sermon on the mount. You know like instead of an eye for an eye… Jesus said turn the other cheek instead, etc.
An example of a least command by Jesus at the sermon on the Mount would be rejoicing when somebody reviles, persecuted, and or speaks falsely against us for the Lord’s sake (See: Matthew 5:11-12). For this command is not attached with any warnings of hellfire or condemnation and it does not appear to be a major violation of loving God and or others if we fail to obey it. Granted, we should obey the Lord in everything of course. So if this happens for us as believers, we should rejoice indeed.
Again, there is no Sabbath command given to us in the New Testament.
There are no sins that say one is the breaking the weekly Sabbath found in the New Testament.
In fact, Gentile Christians are told that they do not have to keep the Law of Moses in Acts of the Apostles 15:5, and
Acts of the Apostles 15:24 very clearly. Don’t believe me? Just read Acts 15:24 in the King James Bible very slowly word for word. For Acts of the Apostles 13:39 says we cannot be justified by the Law of Moses. For if we seek to be justified by the Law, we have fallen from grace (Galatians 5:4). This would be the Old law and not the Laws of Christ (Galatians 6:2, Romans 8:2, and 1 Corinthians 9:21).
Please take no offense, but my experience is that when SDAs see words like: “
commandments,” they automatically think the Ten Commandments and think the SABBATH. I think that is a poor way to read the Bible - IMHO. One should read the Bible in context and not with a Sabbath day bias. Anyways, I already stated my reasons with Scripture why I believe the way I do on the Lord’s day in Revelation 1:10. If you don’t accept it, and you just want to see the Sabbath, that is your choice. We can simply can agree to disagree in love and respect and move on.
In the days of Jeremiah is when God established the New Covenant. You say the New Covenant is in the millennium which would than make you in the Old Covenant, but we are all in the New Covenant. God said in the New Covenant He would write His laws in our hearts Jer 31:31-33. Notice God does not say His laws except for My holy day and the one I told you to REMEMBER that one you can now forget. How confusing would that be?
As you can clearly see from these scriptures the Sabbath is still part of the law i.e. Ten Commandments in the New Testament and New Covenant.
But when the Pharisees saw it, they said unto him, Behold, thy disciples do that which is not
lawful to do upon the
sabbath day.
- Matthew 12:2
And, behold, there was a man which had his hand withered. And they asked him, saying, Is it
lawful to heal on the
sabbath days? that they might accuse him.
- Matthew 12:10
How much then is a man better than a sheep? Wherefore it is
lawful to do well on the
sabbath days.
- Matthew 12:12
And the Pharisees said unto him, Behold, why do they on the
sabbath day that which is not
lawful?
- Mark 2:24
And they watched him, whether he would heal him on the
sabbath day; that they might accuse him.
- Mark 3:2
And he saith unto them, Is it
lawful to do good on the
sabbath days, or to do evil? to save life, or to kill? But they held their peace.
- Mark 3:4
And certain of the Pharisees said unto them, Why do ye that which is not
lawful to do on the
sabbath days?
- Luke 6:2
And now when the even was come, because it was the preparation, that is, the day before the
sabbath,
- Mark 15:42
Then said Jesus unto them, I will ask you one thing; Is it
lawful on the
sabbath days to do good, or to do evil? to save life, or to destroy it?
- Luke 6:9
And Jesus answering spake unto the lawyers and Pharisees, saying, Is it
lawful to heal on the
sabbath day?
- Luke 14:3
Therefore the Jews sought the more to kill him, because he not only had
broken the sabbath, but said also that God was his Father, making himself equal with God.
- John 5:18
And they returned, and prepared spices and ointments; and
rested the sabbath day according to the commandment.
- Luke 23:56
These are some of the scriptures that talk about the Sabbath being a law in the New Testament. There is no scripture that says this law was done away with. With how much the law of God's 4th commandment was enforced any change would have caused a major uproar in scripture, not silence. Jesus would have said
something about the change. You are going off the writings of Paul that even the disciples of his time said they had a hard time understanding him. Even Paul told us to KEEP THE COMMANDMENTS OF GOD which includes the 4th commandment 1 Cor 7:19 There are lots of scriptures showing Sabbath was the day when the disciples and Jesus was in the Temples. This is consistent with the fact that the seventh day is
THE holy day of our Lord thy God and is the Lord's day according to God. Exodus 20:8-11, Isaiah 58:13, Isaiah 66:23. You can obey the commandment of God or follow the traditions that we are warned about by Jesus Matthew 15:3-9.