Deuteronomy 13:6-10

If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, that is as thine own soul, entice thee secretly, saying, Let us go and serve other gods, which thou hast not known, thou, nor thy fathers; of the gods of the peoples that are round about you, nigh unto thee, or far off from thee, from the one end of the earth even unto the other end of the earth; thou shalt not consent unto him, nor hearken unto him; neither shall thine eye pity him, neither shalt thou spare, neither shalt thou conceal him: but thou shalt surely kill him; thy hand shall be first upon him to put him to death, and afterwards the hand of all the people. And thou shalt stone him to death with stones, because he hath sought to draw thee away from Jehovah thy God, who brought thee out of the land of Egypt, out of the house of bondage.