Sabbath keeping belonged to the Jewish dispensation, Exodus 20:8 Remember the Sabbath day, to keep it holy.
For the Sabbath to be binding today, the Old Testament would have to be binding today. The law of Moses which included the Sabbath command, has been done away, Colossians 2:14-17
Having wiped out the handwriting of requirements(law of Moses) that was against us, which was contrary to us. And HE HAS TAKEN IT OUT OF THE WAY, HAVING NAILED IT TO THE CROSS. Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it. So let no one judge you in food or in drink, or regarding a festival or a new moon or SABBATHS. Which are a shadow of things to come, but the substance is of Christ.
The Sabbath command was given to fleshly Isreal Exodus 20:1-2 And God spoke all these words saying: I am the Lord your God, who brought you out of the land of Egypt, out of the house of bondage.
Exodus 31:12-13 And the Lord spoke to Moses, saying, Speak also to the children of Isreal saying: Surely My Sabbaths you shall keep, for it is a sign between Me and you(jews) throughout your generations, that you may know that I am the Lord who sanctifies you.
Deuteronomy 5:1-3 And Moses called all Israel and said to them: Hear, O Israel, the statutes and judgements which I speak in your hearing today, that you may learn them and be careful to observe them. The Lord our God made a COVENANT WITH US in Horeb. The Lord did not make this covenant with our fathers, BUT WITH US, those who are here today, all of US who are alive.
If you keep the Sabbath day, were you among those brought out of Egypt?
If the Sabbath day is still binding, then in order to keep the Sabbath properly, you would have to:
Do no servile work, Exodus 35:1-3 Then Moses gathered all the congregation of the children of Israel together and said to them, These are the words which the Lord has commanded you to do: Work shall be done for six days, but the seventh day shall be a holy day for you, a Sabbath of rest to the Lord. Whoever does any work on it SHALL BE PUT TO DEATH. You shall kindle no fire throughout your dwellings on the Sabbath day.
Offer a burnt offering, Numbers 28:9-10 And on the Sabbath day two lambs in their first year, without blemish and two-tenths of an ephah of fine flour as a grain offering, mixed with oil, and its drink offering- this is the burnt offering for every Sabbath, besides the regular burnt offering with its drink offering.
Kindle no fire, Exodus 35:3
And not go out of your place, Exodus 16:29 See! For the Lord has given you the Sabbath; therefore He gives you on the sixth day bread for two days. Let every man remain in his place; let no man go out of his place on the seventh day.
Do you do this?
Keeping the Sabbath day makes one a debtor to do the whole law, Galatians 5:3 And I testify again to every man who becomes circumcised, Christ will profit you nothing.
Galatians 5:1 Stand fast therefore in the liberty by which Christ has made us free and do not be entangled again with a yoke of bondage.
If you keep the Sabbath do you burn incense, offer animal sacrifices and go to Jerusalem to worship three times in a year?
We live under the law of Christ, Galatians 6:2 Bear one another's burdens and so fulfil the law of Christ.
And Christians are bound to keep the first day of the week, Acts 20:7; 1Corinthians 16:1-2
Now concerning the collection for the saints, as I have given orders to the churches of Galatia, so you must do also: On the first day of the week let each one of you lay something aside, storing up as he may prosper, that there be no collections when I come
In the new testament there is no command to keep the Sabbath day and no penalty for not keeping it.