Exodus 34:14-17

—for you shall not worship any other god, for the LORD, whose name is Jealous, is a jealous God— otherwise you might make a covenant with the inhabitants of the land and they would play the harlot with their gods and sacrifice to their gods, and someone might invite you to eat of his sacrifice, and you might take some of his daughters for your sons, and his daughters might play the harlot with their gods and cause your sons also to play the harlot with their gods. You shall make for yourself no molten gods.