Deuteronomy 6:14-16

14Do not try to serve other gods. They are the gods that the people who live around you worship.

15The Lord your God lives among you. He wants you to belong to him alone. If you worship other gods, he will be very angry with you. He will completely destroy you from the whole earth.

16Do not test the Lord your God, to see what he will do. That is what you did at Massah.