Deuteronomy 13:6-9

6“If your brother, the son of your mother, or your son or daughter, or the wife you cherish, or your friend who is as [precious to you as] your own life (soul), entices you secretly, saying, ‘Let us go and serve other gods’ (gods whom neither you nor your fathers have known,

7of the gods of the peoples who are around you, near you or far from you, from one end of the earth to the other),

8you shall not consent to him or listen to him; and your eye shall not pity him, nor shall you spare him or conceal him.

9Instead, you shall most certainly execute him; your hand shall be first [to be raised] against him to put him to death, and afterwards the hand of all the people.