Exodus 34:13

10 And he said, Behold, I make a covenant: before all thy people I will do marvels, such as have not been wrought in all the earth, nor in any nation; and all the people among which thou art shall see the work of Jehovah; for it is a terrible thing that I do with thee.

11 Observe thou that which I command thee this day: behold, I drive out before thee the Amorite, and the Canaanite, and the Hittite, and the Perizzite, and the Hivite, and the Jebusite.

12 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:

13 but 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:

15 lest 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;

16 and 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.