1 Kings 2:28-29

28Now the news reached Joab, for Joab had supported and followed Adonijah, although he had not followed Absalom. So Joab fled to the [sacred] tent of the Lord and took hold of the horns of the altar [to seek asylum].

29King Solomon was told that Joab had fled to the tent of the Lord and was at that moment beside the altar. Then Solomon sent Benaiah the son of Jehoiada, saying, “Go, strike him down.”