Deuteronomy 8:11-9:3

Take care lest you forget the Lord your God and fail to keep His commandments, His rules, and His laws, which I enjoin upon you today. When you have eaten your fill, and have built fine houses to live in, and your herds and flocks have multiplied, and your silver and gold have increased, and everything you own has prospered, beware lest your heart grow haughty and you forget the Lord your God--who freed you from the land of Egypt, the house of bondage; who led you through the great and terrible wilderness with its seraph serpents and scorpions, a parched land with no water in it, who brought forth water for you from the flinty rock; who fed you in the wilderness with manna, which your fathers had never known, in order to test you by hardships only to benefit you in the end--and you say to yourselves, "My own power and the might of my own hand have won this wealth for me." Remember that it is the Lord your God who gives you the power to get wealth, in fulfillment of the covenant that He made on oath with your fathers, as is still the case. If you do forget the Lord your God and follow other gods to serve them or bow down to them, I warn you this day that you shall certainly perish; like the nations that the Lord will cause to perish before you, so shall you perish--because you did not heed the Lord your God. Hear, O Israel! You are about to cross the Jordan to go in and dispossess nations greater and more populous than you: great cities with walls sky-high; a people great and tall, the Anakites, of whom you have knowledge; for you have heard it said, "Who can stand up to the children of Anak?" Know then this day that none other than the Lord your God is crossing at your head, a devouring fire; it is He who will wipe them out. He will subdue them before you, that you may quickly dispossess and destroy them, as the Lord promised you.