God set the example back in the beginning after creation when he rested on the seventh day. The Sabbath is not part of ‘Jewish law’ but part of God’s Law for mankind found in the Ten Commandments where God REMINDED Israel of when the Sabbath was first given to man. If we can lay aside the keeping of the Sabbath due to Messiah’s death and resurrection, are we then allowed to forget the other nine commandments? Of course not.
Exodus 20:8 Remember the sabbath day, to keep it holy. 9 Six days shalt thou labour, and do all thy work: 10 But the seventh day is the sabbath of the Lord thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates: 11 For in six days the Lord made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the Lord blessed the sabbath day, and hallowed it.
As for the idea that the Sabbath is only for the Jews, Isaiah writes that the eunuch (slave) and stranger (foreigner) who joined themselves to Israel as converts were to also enjoy the Sabbath rest. Are we gentile Christians not ‘joined’ with Israel as ‘wild branches’ being grafted into the olive tree?
Romans 11:17 But if some of the branches were broken off, and you, although a wild olive shoot, were grafted in among the others and now share in the nourishing root[b] of the olive tree, 18 do not be arrogant toward the branches. If you are, remember it is not you who support the root, but the root that supports you. 19 Then you will say, “Branches were broken off so that I might be grafted in.” 20 That is true. They were broken off because of their unbelief, but you stand fast through faith. So do not become proud, but fear. 21 For if God did not spare the natural branches, neither will he spare you.
Isaiah 56:4-8 4 For thus saith the Lord unto the eunuchs that keep my sabbaths, and choose the things that please me, and take hold of my covenant; 5 Even unto them will I give in mine house and within my walls a place and a name better than of sons and of daughters: I will give them an everlasting name, that shall not be cut off. 6 Also the sons of the stranger, that join themselves to the Lord, to serve him, and to love the name of the Lord, to be his servants, every one that keepeth the sabbath from polluting it, and taketh hold of my covenant; 7 Even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt offerings and their sacrifices shall be accepted upon mine altar; for mine house shall be called an house of prayer for all people. 8 The Lord God, which gathereth the outcasts of Israel saith, Yet will I gather others to him, beside those that are gathered unto him.