Jesus was born under the Law. We have been born under Grace. IMHO, there is a significant difference in the two covenants.
Jesus' 3,5 year ministry was the first half of Daniel's 70th week in which He began to transition the Old Covenant into the New one (a better covenant):
Heb 8:6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
Heb 8:7 For if that first [covenant] had been faultless, then should no place have been sought for the second.
And as the Olivet Discourse revealed, no longer would outward rituals under the Law, be enough to keep His commandments, but our hearts and minds must be turned towards Him:
Matt 5:27 Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
Matt 5:28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
What was the point of the Law?
Gal 3:19 Wherefore then [serveth] the law? It was added because of transgressions, till the seed should come to whom the promise was made; [and it was] ordained by angels in the hand of a mediator.
Gal 3:21 [Is] the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law.
Gal 3:22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe.
After Messiah was cut off mid-week and the sacrifices ended forever, the Gospel of the Kingdom was preached exclusively to Israel for another 3.5 years, as promised. (Joel's prophecy was fulfilled on the Day of Pentecost, and the last days began right there):
Acts 2:15 For these are not drunken, as ye suppose, seeing it is [but] the third hour of the day.
Acts 2:16 But this is that which was spoken by the prophet Joel;
Acts 2:17 And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:
Later, commanded by God, Paul pronounced the end of Daniel's 70th week, giving the Gospel to the Gentiles instead (all the nations), thus marking the end of the transition of the Old Covenant into the New Covenant in His Blood:
Acts 13:46 Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
Acts 28:27 For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with [their] eyes, and hear with [their] ears, and understand with [their] heart, and should be converted, and I should heal them.
Acts 28:28 Be it known therefore unto you, that the salvation of God is sent unto the Gentiles, and [that] they will hear it.
The Disciples, and the New Covenant churches, met on the first day of the week, Sunday, (according to Scripture) because all who have faith in Christ, have entered into His Eternal Rest, now, and will continue throughout the Millennial Reign.
Acts 20:7 And upon the first [day] of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.
1Cor 16:2 Upon the first [day] of the week let every one of you lay by him in store, as [God] hath prospered him, that there be no gatherings when I come.
No longer would people do their own work for six days, then rest, as in the Old Covenant, but in this New Covenant, the Saints take their rest in His finished work on the Cross:
John 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost).
If one is keeping an Old Covenant 7th Day Sabbath, it can only be in the hope of gaining favor with God, or feeling good about doing something "for Him"; but we cannot "do" anything for Him; He has done it all for us, therefore, we do not require a day of rest:
Gal 4:4 ...God sent forth his Son, made of a woman, made under the law,
(Gal 4:5 To redeem them that were under the law, that we might receive the adoption of sons.
Gal 4:6 And because ye are sons...
Gal 4:7 Wherefore thou art no more a servant, but a son;...
Gal 4:9 But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?
Gal 4:10 Ye observe days, and months, and times, and years.
Gal 4:11 I am afraid of you, lest I have bestowed upon you labour in vain.
Every single day is the Sabbath Day rest for the New Covenant Believer. Our only "works" are those He planned for us to do beforehand, (we don't have our own works):
Eph 2:10 For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
Jesus boiled it down as to what are the commandments of God; nothing more is required?
Matt 22:37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
(att 22:38 This is the first and great commandment.
Matt 22:39 And the second [is] like unto it, Thou shalt love thy neighbour as thyself.
Matt 22:40 On these two commandments hang all the law and the prophets.
