Exodus 34:13

10 And He saith, `Lo, I am making a covenant: before all thy people I do wonders, which have not been done in all the earth, or in any nation, and all the people in whose midst thou [art] have seen the work of Jehovah, for it [is] fearful that which I am doing with thee.

11 `Observe for thyself that which I am commanding thee to-day: lo, I am casting out from 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 inhabitant of the land into which thou art going, lest it become a snare in thy midst;

13 for their altars ye break down, and their standing pillars ye shiver, and its shrines ye cut down;

14 for ye do not bow yourselves to another god -- for Jehovah, whose name [is] Zealous, is a zealous God.

15 `Lest thou make a covenant with the inhabitant of the land, and they have gone a-whoring after their gods, and have sacrificed to their gods, and [one] hath called to thee, and thou hast eaten of his sacrifice,

16 and thou hast taken of their daughters to thy sons, and their daughters have gone a-whoring after their gods, and have caused thy sons to go a-whoring after their gods;