1 Kings 2:28-29

28Then news came to Joab, for Joab had defected to Adonijah, though he had not defected to Absalom. So Joab fled to the tabernacle of the Lord, and took hold of the horns of the altar.

29And King Solomon was told, “Joab has fled to the tabernacle of the Lord; there he is, by the altar.” Then Solomon sent Benaiah the son of Jehoiada, saying, “Go, strike him down.”