Genesis 2:3
3. blessed and sanctified the seventh day—a peculiar distinction put upon it above the other six days, and showing it was devoted to sacred purposes. The institution of the Sabbath is as old as creation, giving rise to that weekly division of time which prevailed in the earliest ages. It is a wise and beneficent law, affording that regular interval of rest which the physical nature of man and the animals employed in his service requires, and the neglect of which brings both to premature decay. Moreover, it secures an appointed season for religious worship, and if it was necessary in a state of primeval innocence, how much more so now, when mankind has a strong tendency to forget God and His claims?
Ezekiel 20:12
12. sabbaths, . . . a sign between me and them—a kind of sacramental pledge of the covenant of adoption between God and His people. The Sabbath is specified as a sample of the whole law, to show that the law is not merely precepts, but privileges, of which the Sabbath is one of the highest. Not that the Sabbath was first instituted at Sinai, as if it were an exclusively Jewish ordinance (Ge 2:2, 3), but it was then more formally enacted, when, owing to the apostasy of the world from the original revelation, one people was called out (De 5:15) to be the covenant-people of God.
sanctify them—The observance of the Sabbath contemplated by God was not a mere outward rest, but a spiritual dedication of the day to the glory of God and the good of man. Otherwise it would not be, as it is made, the pledge of universal sanctification (Ex 31:13-17; Isa 58:13, 14). Virtually it is said, all sanctity will flourish or decay, according as this ordinance is observed in its full spirituality or not.