Deuteronomy 8:3, 16

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.

who fed you in the wilderness with manna that your fathers did not know, that he might humble you and test you, to do you good in the end.