Deuteronomy 8:15-16

15who led thee through the great and terrible wilderness, [a wilderness of] fiery serpents, and scorpions, and drought, where there is 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;