Deuteronomy 31:16

16The Lord said to Moses, “Behold, you are about to lie down [in death] with your fathers; and this people will arise and 31:16 I.e. abandon the true God for worthless idols.play the prostitute (commit apostasy) with the foreign gods [of the people] of the land, where they go to be among them. They will abandon (turn away from) Me and break My covenant which I have made with them.