Deuteronomy 8:16-20

8:16 fed 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. 8:17 Be careful not to say, “My own ability and skill have gotten me this wealth.” 8:18 You 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. 8:19 Now 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. 8:20 Just like the nations the Lord is about to destroy from your sight, so he will do to you because you would not obey him.