Exodus 31:12-13

Exodus 31:12-13 AMP

And the LORD said to Moses, “But as for you, say to the Israelites, ‘You shall most certainly observe My Sabbaths, for it is a sign between Me and you throughout your generations, so that you may know [without any doubt] and acknowledge that I am the LORD who sanctifies you and sets you apart [for Myself].

Read Exodus 31