Deuteronomy 8:14-16

MKJV(i) 14 then your heart might be lifted up, and you might forget Jehovah your God who brought you forth out of the land of Egypt, from the house of slaves. 15 He led you through the great and terrible wilderness, with fiery serpents and scorpions and thirsty ground, where there 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, so that He might humble you and so that He might prove you, to do you good in your latter end,