I was just reading Deuteronomy 5. It's amazing the things I come across just by accident.

"Observe the Sabbath day by keeping it holy, as the Lord your God has commanded you. Six days a week are set apart for your daily duties and regular work, but the seventh day is a day of rest dedicated to the Lord your God. On that day no one in your household may do any kind of work. This includes you, your sons and daughters, your male and female servants, your oxen and donkeys and other livestock, and any foreigners living among you. All your male and female servants must rest as you do. Remember that you were once slaves in Egypt and that the Lord your God brought you out with amazing power and mighty deeds. That is why the Lord your God has commanded you to observe the Sabbath day" (Deut. 5.12-15).

Two things to note here: 1) It was the ancient Hebrews who were to observe the Sabbath because it was they who came out of Egypt specifically and it was they who were to be stoned to death if they did not keep the Sabbath and none other; 2) Just as the Jews were once slaves they are to treat their own slaves with respect, because the Jews know what suffering is, so let slaves rest on Sunday. Be sympathetic. Today, slavery is outlawed.

There is a reason why it is called the Old Testament and New Testament, because the old has passed though not one tittle of the law passes till these things be finished as described in Scripture (not just the end of this dispensation but the end of the 1000 year reign of Christ). Though the law remains, we don't live by the law, but by the Spirit of the law since Jesus already filled up the law. Amen.