Exodus 31:13
13 “You are to speak to the people of Israel and say, ‘Above all you shall keep my Sabbaths, for this is a sign between me and you throughout your generations, that you may know that I, the Lord, sanctify you.
Exodus 31:16–17
16 Therefore the people of Israel shall keep the Sabbath, observing the Sabbath throughout their generations, as a covenant forever. 17 qIt is a sign forever between me and the people of Israel that rin six days the Lord made heaven and earth, and son the seventh day he rested and was refreshed.’”