Deuteronomy 8:11-14, 19 (New Revised Standard Version)
Take care that you do not forget the Lord your God, by failing to keep his commandments, his ordinances, and his statutes, which I am commanding you today. When you have eaten your fill and have built fine houses and live in them, and when your herds and flocks have multiplied, and your silver and gold is multiplied, and all that you have is multiplied, then do not exalt yourself, forgetting the Lord your God, who brought you out of the land of Egypt, out of the house of slavery....If you do forget the Lord your God and follow other gods to serve and worship them, I solemnly warn you today that you shall surely perish.
Matthew 6:24 (New Revised Standard Version)
No one can serve two masters; for a slave will either hate the one and love the other, or be devoted to the one and despise the other. You cannot serve God and wealth.