"The controversy that has turned on the question as to whether or not, in the Christian dispensation, the Sabbath is the first day of the week or the seventh, and as to whether we can be said to observe the fourth commandment when we substitute the first day of the week for the seventh, has too often been allowed to obscure the central principle, namely, that every recurring seventh day was by divine ordination distinguished from every other day. The difficulty that may be encountered in determining which day of the week is the Sabbath should never be used as a subterfuge to escape from the central and straightforward import of the commandment, that every recurring seventh day is specifically holy to God. At the cost of repetitiousness, may we say, that the principle should never be perplexed or prejudices by the further question: which day in the succession of days should be accorded that distinction? We may not minimize the importance of this latter question. But we must not allow the difficulties that may attend this question to unsettle what is antecedent and even more central, the obligation, so far as the fourth commandment is concerned, to recognize the divine distinctiveness of every recurring seventh day" (John Murray)
"Finally, the reason assigned for this Lordship over the Sabbath is the fact that the Sabbath was made for man. It was for the sake of man that Jesus came into the world, it was for manâ€™s sake that He died and rose again, it is for manâ€™s sake that He is exalted as the Messiah to supreme mediatorial sovereignty. But it was also for manâ€™s sake that the Sabbath was made. If then, it was for manâ€™s sake that Jesus came, and suffered, and died, and rose again to ascend up where He was before, is it possible that that which was made for man â€” the Sabbath â€” should be annulled and abrogated by that which He became and did for manâ€™s sake? There is complete congruity between His Messianic work and Lordship on the one hand and the Sabbath ordinance on the other. They both serve the same purpose. And so His Lordship embraces the Sabbath institution, embraces it too for the purpose of preserving it, confirming it and blessing it. He is Lord of the Sabbath too. (J.Murray)The 4th Commandment
Keep ALL God's Commandments including the 4th which nowhere in the Word or Law of God is annulled. GOD nor Christ has annulled the Sabbath. Obey the Lord!