Deuteronomy 8:18-20

18But thou shalt remember Yhwh thy God: for it is he that giveth thee power to get wealth, that he may establish his covenant which he sware unto thy fathers, as it is this day.

19And it shall be, if thou do at all forget Yhwh thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.

20As the nations which Yhwh destroyeth before your face, so shall ye perish; because ye would not be obedient unto the voice of Yhwh your God.