Deuteronomy 13:9 (KJV)

Namely, of the gods of the people which 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; thine hand shall be first upon him to put him to death, and afterwards the hand of all the people.

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

And all Israel shall hear, and fear, and shall do no more any such wickedness as this is among you.