Deuteronomy 8:2-3

VIN(i) 2 "Remember how the LORD your God led you all the way these 40 years in the desert, to humble and test you in order to make known what was in your heart, whether or not you would keep his commands. 3 He humbled you and allowed you to suffer hunger, and fed you with manna, which you didn't know, neither did your fathers know, that He might make you know that man does not live by bread only, but by every word that proceeds out of the mouth of the LORD.