Deuteronomy 8:2-3, 16

Remember how the LORD your God has led you in the desert for these forty years, taking away your pride and testing you, because he wanted to know what was in your heart. He wanted to know if you would obey his commands. He took away your pride when he let you get hungry, and then he fed you with manna, which neither you nor your ancestors had ever seen. This was to teach you that a person does not live on bread alone, but by everything the LORD says.

and manna to eat in the desert. Manna was something your ancestors had never seen. He did this to take away your pride and to test you, so things would go well for you in the end.