It was reported to Solomon: “Adonijah, in fear of King Solomon, is clinging to the horns of the altar and saying, ‘Let King Solomon first swear that he will not kill me, his servant, with the sword.’”
When the news came to Joab, since he had sided with Adonijah, though not with Absalom, he fled to the tent of the Lord and clung to the horns of the altar.
Once a year Aaron shall purge its horns. Throughout your generations he is to purge it once a year with the blood of the atoning purification offering. This altar is most sacred to the Lord. Census Tax.