Exodus 34:12-14

Take 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: but ye shall break down their altars, and dash in pieces their pillars, and ye shall cut down their Asherim; (for thou shalt worship no other god: for Jehovah, whose name is Jealous, is a jealous God)