Lev 23:2 Speak unto the children of Israel, and say unto them, Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations, even these are my feasts.
Lev 23:3 Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings.
Now if your Bible says "Sabbath of the Jews" here, return it and get your money back, it contains misprints. The Sabbath was made for the Jews?
Mar 2:27 And he said unto them, The sabbath was made for man, and not man for the sabbath:
The word for man here is...
G444
ἄνθρωπος
anthrōpos
anth'-ro-pos
From G435 and ὤψ ōps (the countenance; from G3700); manfaced, that is, a human being: - certain, man.
It does not mean for Jew, it means human beings.
Are Gentiles to keep the Sabbath?
Isa 56:1 Thus saith the LORD, Keep ye judgment, and do justice: for my salvation is near to come, and my righteousness to be revealed.
Isa 56:6 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;
Isa 56:7 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.
The word for stranger in verse 56...
H5236
נכר
nêkâr
nay-kawr'
From H5234; foreign, or (concretely) a foreigner, or (abstractly) heathendom: - alien, strange (+ -er).
A gentile, one who is not of Israel.
Who will keep the Sabbath in the Millennium?
Isa 66:22 For as the new heavens and the new earth, which I will make, shall remain before me, saith the LORD, so shall your seed and your name remain.
Isa 66:23 And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.
Notice that ALL FLESH will keep the Sabbath. Again, if your Bible says "Jewish flesh" here, return it and get your money back.