Deuteronomy 8:2-4

2Remember how the Lord your God led you through the wilderness for these forty years, humbling you and testing you to prove your character, and to find out whether or not you would obey his commands.

3Yes, he humbled you by letting you go hungry and then feeding you with manna, a food previously unknown to you and your ancestors. He did it to teach you that people do not live by bread alone; rather, we live by every word that comes from the mouth of the Lord.

4For all these forty years your clothes didn’t wear out, and your feet didn’t blister or swell.