The Sabbath is and will also be on the seventh day.
God said so and no one has the authority to alter His Word, nor would He alter it. Deut 4:2 Psa 89:34 Mat 5:18
Only God can reverse His blessing ,not man Num 23:20 the day of corporate worship was changed, but not by God, just as predicted in God's holy Word Dan 7:25. We see a clear history of man changing God's Sabbath I will leave a few quotes down below.
Exodus 20:10 but the seventh day is the Sabbath of the Lord your God
The Lord's Days is the seventh day if we are to believe thus saith the Lord is our Authority
Isa 58:13 “If you turn away your foot from the Sabbath,
From doing your pleasure on My holy day,
And call the Sabbath a delight,
The holy day of the Lord honorable,
And shall honor Him, not doing your own ways,
Nor finding your own pleasure,
Nor speaking your own words,
God said all other days are working days Exo 20:9
The question is should we have faith in God to live by His every Word Mat 4:4 or follow popular traditions of man.
Jesus tells us which path to take, yet how many people believe Him. Mat 15:3-14
Christ equates keeping the Sabbath as joining ourselves with Christ, loving His name and being His servant. He says it is righteous and justice and Christ righteousness is everlasting Psa 119:142 ours are like fifthly rags Isa 64:6. Do we seek our righteousness or Christs?
Isa 56:1 Thus says the Lord:
“Keep justice, and do righteousness,
For My salvation is about to come,
And My righteousness to be revealed.
2 Blessed is the man who does this,
And the son of man who lays hold on it;
Who keeps from defiling the Sabbath,
And keeps his hand from doing any evil.”
6 “Also the sons of the foreigner
Who join themselves to the Lord, to serve Him,
And to love the name of the Lord, to be His servants—
Everyone who keeps from defiling the Sabbath,
And holds fast My covenant
It comes down to who do we listen to. God- who said Remember the Sabbath day to keep it holy, or man, who teaches to forget.
Just as predicted Dan 7:25. Man would change God's Sabbath, that almost the whole world followed just as predicted. No wonder He is calling us out of our false teachings Rev 18:4 as we must worship Him in Truth and Spirit and all God's commandments are Truth Psa 119:151
Deny the authority of the Church and you have no adequate or reasonable explanation or justification for the substitution of Sunday for Saturday in the Third - Protestant Fourth - Commandment of God... The Church is above the Bible, and this transference of Sabbath observance is proof of that fact.'
—Catholic Record, September 1, 1923.
Of course the Catholic Church claims that the change was her act. And the act is a mark of her ecclesiastical power and authority in religious matters.
—C. F. Thomas, Chancellor of Cardinal Gibbons, in answer to a letter regarding the change of the Sabbath, November 11, 1895.
In the end we will either receive the seal of God, which is found in the Sabbath Exo 20:11 or we will receive the mark of the beast. Our only safeguard is obeying God's commandments Rev 14:11-12 because it shows who our allegiance is to. Eze 20:20