And the priest shall take some of its blood with his finger and put it on the horns of the altar of burnt offering and pour out all the rest of its blood at the base of the altar.
1 Kings 2:28 ESV
When the news came to Joab—for Joab had supported Adonijah although he had not supported Absalom—Joab fled to the tent of the Lord and caught hold of the horns of the altar.