Deuteronomy 6:10-15

"And when the LORD your God brings you into the land which he swore to your fathers, to Abraham, to Isaac, and to Jacob, to give you, with great and goodly cities, which you did not build, and houses full of all good things, which you did not fill, and cisterns hewn out, which you did not hew, and vineyards and olive trees, which you did not plant, and when you eat and are full, then take heed lest you forget the LORD, who brought you out of the land of Egypt, out of the house of bondage. "You shall fear the LORD your God; you shall serve him, and swear by his name. You shall not go after other gods, of the gods of the peoples who are round about you; for the LORD your God in the midst of you is a jealous God; lest the anger of the LORD your God be kindled against you, and he destroy you from off the face of the earth."