Deuteronomy 8:19

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.

Deuteronomy 13:13

13:13 some evil people have departed from among you to entice the inhabitants of their cities, saying, “Let’s go and serve other gods” (whom you have not known before).

Deuteronomy 28:64

28:64 The Lord will scatter you among all nations, from one end of the earth to the other. There you will worship other gods that neither you nor your ancestors have known, gods of wood and stone.