Deuteronomy 8:16-20

16fed you in the desert with manna (which your ancestors had never before known) so that he might by humbling you test you and eventually bring good to you.

17Be careful not to say, “My own ability and skill have gotten me this wealth.”

18You must remember the Lord your God, for he is the one who gives ability to get wealth; if you do this he will confirm his covenant that he made by oath to your ancestors, even as he has to this day.

19Now if you forget the Lord your God at all and follow other gods, worshiping and prostrating yourselves before them, I testify to you today that you will surely be annihilated.

20Just like the nations the Lord is about to destroy from your sight, so he will do to you because you would not obey him.