Deuteronomy 13:5-6

5You must punish that false prophet with death. He has told you to turn against the Lord your God. The Lord rescued you from Egypt, where you were slaves. But the false prophet has tried to turn you away from the way of life that the Lord your God has commanded. So you must remove all evil things like that from among you.

6Even someone in your own family may try to turn you away from the Lord. It may be your own brother, your son or your daughter. It may be your wife whom you love. It may be a friend that you like very much. They may say to you secretly, ‘We should worship other gods.’ Those are gods that you and your ancestors never knew about before.