Deuteronomy 8:14-16

14then your heart will become proud, and you will forget the LORD your God who brought you out of the land of Egypt, out of the house of slavery.

15He led you through the vast and terrifying wilderness with its venomous snakes and scorpions, a thirsty and waterless land. He brought you water from the rock of flint. 16He fed you in the wilderness with manna that your fathers had not known, in order to humble you and test you, so that in the end He might cause you to prosper.