Exodus 31:13 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. 14 Ye shall keep the sabbath therefore; for it is holy unto you.
[The Great Controversy pp 451] The work of Sabbath reform to be accomplished in the last days is foretold in the prophecy of Isaiah: “Thus saith the Lord, Keep ye judgment, and do justice; for my salvation is near to come, and my righteousness to be revealed. 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.”
“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; even them will I bring to my holy mountain, and make them joyful in my house of prayer.” [Isaiah 56:1, 2, 6, 7.] These words apply in the Christian age, as is shown by the context: “The Lord God which gathereth the outcasts of Israel saith, Yet will I gather others to him, beside those that are gathered unto him.” [Isaiah 56:8.]
Here is foreshadowed the gathering in of the Gentiles by the gospel. And upon those who then honor the Sabbath, a blessing is pronounced. Thus the obligation of the fourth commandment extends past the crucifixion, resurrection, and ascension of Christ, to the time when his servants should preach to all nations the message of glad tidings.
Mark 2:27 And he said unto them, The sabbath was made for man, and not man for the sabbath: 28 Therefore the Son of man is Lord also of the sabbath.
May The Lord add His blessing to the study of His word. God bless!