Thou shalt kill him — Not privately, which pretence would have opened the door to innumerable murders, but by procuring his death by the sentence of the magistrate. Thou shalt cast the first stone at him, as the witness was to do.
Related Commentaries of Deuteronomy 13:9
Deuteronomy 13:9
9 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.