Exodus 34:13-16

13but ye shall break down their altars, and dash in pieces their pillars, and ye shall cut down their Asherim; 14(for thou shalt worship no other god: for Jehovah, whose name is Jealous, is a jealous God); 15lest thou make a covenant with the inhabitants of the land, and they play the harlot after their gods, and sacrifice unto their gods, and one call thee and thou eat of his sacrifice; 16and thou take of their daughters unto thy sons, and their daughters play the harlot after their gods, and make thy sons play the harlot after their gods.