The Bible is quite specific about who the Sabbath is for...
Nehemiah 9:13-14
13 Thou camest down also upon mount Sinai, and spakest with them from heaven, and gavest them right judgments, and true laws, good statutes and commandments:
14 And madest known unto them thy holy sabbath, and commandedst them precepts, statutes, and laws, by the hand of Moses thy servant:
According to Nehemiah, God made the Sabbath known to Moses, so apparently before that, no one kept the Sabbath, God revealed it to Moses.
Exodus 31:12-13
12 And the Lord spake unto Moses, saying,
13 Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the Lord that doth sanctify you.
Exodus 31:16-17
16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.
17 It is a sign between me and the children of Israel for ever: for in six days the Lord made heaven and earth, and on the seventh day he rested, and was refreshed.
It's pretty clear, the Sabbath was specifically for the "children of Israel".
Ezekiel 20:3,12,20
3 Son of man, speak unto the elders of Israel,
12 Moreover also I gave them my sabbaths, to be a sign between me and them, that they might know that I am the Lord that sanctify them.
20 And hallow my sabbaths; and they shall be a sign between me and you, that ye may know that I am the Lord your God.
I don't know how much clearer the Bible can be on this topic. I'd be interested to hear how anyone can look at these scriptures and still say we're all meant to keep the Sabbath.
Nehemiah 9:13-14
13 Thou camest down also upon mount Sinai, and spakest with them from heaven, and gavest them right judgments, and true laws, good statutes and commandments:
14 And madest known unto them thy holy sabbath, and commandedst them precepts, statutes, and laws, by the hand of Moses thy servant:
According to Nehemiah, God made the Sabbath known to Moses, so apparently before that, no one kept the Sabbath, God revealed it to Moses.
Exodus 31:12-13
12 And the Lord spake unto Moses, saying,
13 Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the Lord that doth sanctify you.
Exodus 31:16-17
16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.
17 It is a sign between me and the children of Israel for ever: for in six days the Lord made heaven and earth, and on the seventh day he rested, and was refreshed.
It's pretty clear, the Sabbath was specifically for the "children of Israel".
Ezekiel 20:3,12,20
3 Son of man, speak unto the elders of Israel,
12 Moreover also I gave them my sabbaths, to be a sign between me and them, that they might know that I am the Lord that sanctify them.
20 And hallow my sabbaths; and they shall be a sign between me and you, that ye may know that I am the Lord your God.
I don't know how much clearer the Bible can be on this topic. I'd be interested to hear how anyone can look at these scriptures and still say we're all meant to keep the Sabbath.
Please notice the timeframe and subject here.
Isa 56:2 Blessed is the man that doeth this, and the son of man that layeth hold on it; that keepeth the sabbath from polluting it, and keepeth his hand from doing any evil.
Doesn't say Israelite, just says man.
Isa 56:3 Neither let the son of the stranger, that hath joined himself to the LORD, speak, saying, The LORD hath utterly separated me from his people: neither let the eunuch say, Behold, I am a dry tree.
Do you know what a stranger is?
H5236
נֵכָר
nêkâr
nay-kawr'
From H5234; foreign, or (concretely) a foreigner, or (abstractly) heathendom: - alien, strange (+ -er).
Total KJV occurrences: 36
Isa 56:3 Do not let the son of the foreigner Who has joined himself to the LORD Speak, saying, "The LORD has utterly separated me from His people"; Nor let the eunuch say, "Here I am, a dry tree." - NKJV
Isa 56:4 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;
Isa 56:5 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.
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;
Again, same word and it means Gentile.
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.
What will happen in the Millennium?
Isa 66:23 And it shall come to pass That from one New Moon to another, And from one Sabbath to another, All flesh shall come to worship before Me," says the LORD.
All flesh, not just Jewish flesh, but ALL flesh will keep the Sabbath.
Gen 26:5 because Abraham obeyed My voice and kept My charge, My commandments, My statutes, and My laws."
You do understand that Abraham was not a Jew don't you?
Mat 19:17 So He said to him, "Why do you call Me good? No one is good but One, that is, God. But if you want to enter into life, keep the commandments."
"Keep the Commandments" includes the fourth one.
Rev 22:14 Blessed are those who do His commandments, that they may have the right to the tree of life, and may enter through the gates into the city.
And this occurs after the Millennium, GWTJ and the New Heavens and New Earth.
Let's look at one more point...
Exo 31:13 "Speak also to the children of Israel, saying: 'Surely My Sabbaths you shall keep, for it is a sign between Me and you throughout your generations, that you may know that I am the LORD who sanctifies you.
Who is the Israel of God today?
Gal 6:15 For in Christ Jesus neither circumcision nor uncircumcision avails anything, but a new creation.
Gal 6:16 And as many as walk according to this rule, peace and mercy be upon them, and upon the Israel of God.
Gal 6:17 From now on let no one trouble me, for I bear in my body the marks of the Lord Jesus.
Gal 6:18 Brethren, the grace of our Lord Jesus Christ be with your spirit. Amen.
Who is Paul writing to here?
Gal 1:2 and all the brethren who are with me, To the churches of Galatia: