Deuteronomy 8:14-16

MLV(i) 14 then your heart be lifted up and you forget Jehovah your God, who brought you forth out of the land of Egypt, out of the house of bondage, 15 who led you through the great and terrible wilderness–fiery serpents and scorpions and thirsty ground where was no water–who brought you forth water out of the rock of flint, 16 who fed you in the wilderness with manna, which your fathers did not know, that he might humble you and that he might prove you, to do you good at your latter end.