Deuteronomy 13:6-9

ACV(i) 6 If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, who is as thine own soul, entices thee secretly, saying, Let us go and serve other gods, which thou have not known, thou, nor thy fathers, 7 of the gods of the peoples that are round about you, near to thee, or far off from thee, from the one end of the earth even to the other end of the earth, 8 thou shall not consent to him, nor hearken to him. Neither shall thine eye pity him, neither shall thou spare, neither shall thou conceal him, 9 but thou shall surely kill him. Thy hand shall be first upon him to put him to death, and afterwards the hand of all the people.