Deuteronomy 13:6-9

False Prophets in the Family

13:6 Suppose your own full brother, your son, your daughter, your beloved wife, or your closest friend should seduce you secretly and encourage you to go and serve other gods that neither you nor your ancestors have previously known, 13:7 the gods of the surrounding people (whether near you or far from you, from one end of the earth to the other). 13:8 You must not give in to him or even listen to him; do not feel sympathy for him or spare him or cover up for him. 13:9 Instead, you must kill him without fail! Your own hand must be the first to strike him, and then the hands of the whole community.

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 13:15

13:15 you must by all means slaughter the inhabitants of that city with the sword; annihilate with the sword everyone in it, as well as the livestock.