Deuteronomy 8:3-4

3He humbled you and allowed you to be hungry and fed you with manna, [a substance] which you did not know, nor did your fathers know, so that He might make you understand [by personal experience] that man does not live by bread alone, but man lives by every word that proceeds out of the mouth of the Lord.

4Your clothing did not wear out on you, nor did your feet swell these forty years.