Deuteronomy 13:6-9

6Your own brother, son, or daughter, the wife you love, or your best friend may secretly tempt you, saying, “Let’s go worship other gods.” (Those gods may be gods that you and your ancestors never knew.

7They may be the gods of the people around you, who live near or far, from one end of the land to the other.)

8Don’t be influenced by any of these people or listen to them. Have no pity on them. Don’t feel sorry for them or protect them.

9You must put them to death. You must start the execution. Then all the other people will join you in putting them to death.