Ezekiel 20:12

12. My sabbaths The giving of a stated portion of the week, like the giving of a stated portion of cattle and fruit to the Lord, was an acknowledgment of their acceptance of the covenant of sanctification by which they were pledged to uttermost obedience, as the Lord’s possession, while he was pledged to them in all his fullness of protecting and sanctifying power. The Sabbath was the visible sign to the Hebrews and to the world that they were his, and that he was theirs (Ezekiel 20:20). It was the sign of a covenant in which God separated himself to the people and the people separated themselves to God. The Hebrew Sabbath was not derived from the Babylonian. Indeed, there is no proof, notwithstanding the guesses of Assyriologists, that the Babylonians observed a weekly rest day. Even the existence of the seven-day week among them is not demonstrated (Muss-Arnoldt, Journal Biblical Literature, 1892, part 1).