Deuteronomy 8:14-16

14then your heart will become proud and you will forget the Lord your God, who brought you out of Egypt, out of the land of slavery. 15He led you through the vast and dreadful wilderness, that thirsty and waterless land, with its venomous snakes and scorpions. He brought you water out of hard rock. 16He gave you manna to eat in the wilderness, something your ancestors had never known, to humble and test you so that in the end it might go well with you.