In Acts 10-11 Peter and the Jewish church were still adhering to Jewish dietary laws for the same reason. In Acts 21 Paul underwent a Jewish purification ceremony, which included a Temple offering, in order to reassure Jews that he was not trying to destroy their culture. He also attended synagogues often in order to preach to Jews. But in Acts 15 the Jerusalem Council ruled that Gentile Christians did not have to keep the law of Moses, except for four items that they listed in a letter to all the Gentile churches. Significantly, the Sabbath was not one of them.
Some people point to the creation story as proof that the Sabbath law is eternal.
Since Genesis was one of the five books of the law originally written for Israel, the creation story was naturally used to support the Sabbath command to lsrael. While the Genesis account indicates the need for a weekly day of rest, it does not command Sabbath observance as such. The Bible nowhere states that people before the law observed the Sabbath as a day of rest or worship. Moreover, due to many changes in calendars over the centuries, it is impossible to say that the seventh day of Genesis 2 is the modern Saturday. We should also note that the Bible nowhere indicates that the Sabbath has been changed to Sunday or that God intends for Sunday to be a new Christian Sabbath.