Deuteronomy 8:18-20

18but remember that the Lord your God gives you the power to gain wealth, in order to confirm his covenant he swore to your ancestors, as it is today.

19If you ever forget the Lord your God and follow other gods to serve them and bow in worship to them, I testify against you today that you will certainly perish.

20Like the nations the Lord is about to destroy before you, you will perish if you do not obey the Lord your God.