Deuteronomy 13:9-11

9but thou shalt surely kill him; thine hand shall be first upon him to put him to death, and afterwards the hand of all the people.

10And thou shalt stone him with stones, that he die; because he hath sought to draw thee away from the LORD thy God, which brought thee out of the land of Egypt, out of the house of bondage.

11And all Israel shall hear, and fear, and shall do no more any such wickedness as this is in the midst of thee.