Deuteronomy 8:2-3

NSB(i) 2 »Remember the forty years Jehovah your God led you in the wilderness. He did this in order to humble you and test you. He wanted to know what was in your heart. Whether you would obey his commandments. 3 »He humbled you (allowed you to suffer) with hunger and then fed you with manna. Neither you nor your fathers had seen this before. He did this to teach you that a person cannot live on bread alone but must live on all (everything) (every word) that proceeds from the mouth of Jehovah.