Deuteronomy 8:3-7

And he humbled you and let you hunger and fed you with manna, which you did not know, nor did your fathers know, that he might make you know that man does not live by bread alone, but man lives by every word that comes from the mouth of the LORD. Your clothing did not wear out on you and your foot did not swell these forty years. Know then in your heart that, as a man disciplines his son, the LORD your God disciplines you. So you shall keep the commandments of the LORD your God by walking in his ways and by fearing him. For the LORD your God is bringing you into a good land, a land of brooks of water, of fountains and springs, flowing out in the valleys and hills