Deuteronomy 8:14-16

14Then thy heart shall be lifted up, and thou shalt forget the LORD thy God, who brought thee out of the land of Egypt, from the house of bondage; 15Who led thee through that great and terrible wilderness, with its fiery serpents, and scorpions, and drought, where there 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 test thee, to do thee good at thy latter end;