Deuteronomy 8:14-16

14then thy heart be lifted up, and thou forget Jehovah thy God, who brought thee forth out of the land of Egypt, out of the house of bondage; 15who led thee through the great and terrible wilderness, wherein were fiery serpents and scorpions, and thirsty ground where was no water; who brought thee forth water out of the rock of flint; 16who fed thee in the wilderness with manna, which thy fathers knew not; that he might humble thee, and that he might prove thee, to do thee good at thy latter end: