Deuteronomy 8:2-4

Leeser(i) 2 And thou shalt remember all the way which the Lord thy God hath led thee these forty years in the wilderness, in order to afflict thee, to prove thee, to know what is in thy heart, whether thou wouldst keep his commandments, or not. 3 And he afflicted thee, and suffered thee to hunger, and he gave thee manna to eat, which thou knewest not, and which thy fathers had not known; in order that he might make thee know that not by bread alone man doth live, but by every thing that proceedeth out of the mouth of the Lord doth man live. 4 Thy garment did not fall worn out from thee, and thy foot did not swell, these forty years.