Exodus 34:12-16

12Take heed to thyself, lest thou make a covenant with the inhabitants of the land whither thou goest, lest it be for a snare in the midst of thee:

13but ye shall break down their altars, and dash in pieces their pillars, and ye shall cut down their Asherim:

14for thou shalt worship no other god: for the LORD, whose name is Jealous, is a jealous God:

15lest thou make a covenant with the inhabitants of the land, and they go a whoring after their gods, and do 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 go a whoring after their gods, and make thy sons go a whoring after their gods.