Adonijah was afraid of what Solomon might do to him. So he went and grabbed the horns of the altar for burnt offerings. Those horns stuck out from its upper corners.
Then Solomon was told, “King Solomon, Adonijah is afraid of you. He’s holding onto the horns of the altar. He says, ‘I want King Solomon to make a promise today. I want him to promise that he won’t kill me with his sword.’ ”
News of what Solomon had done reached Joab. Joab had never made evil plans along with Absalom. But he had joined Adonijah. So he ran to the tent of the Lord. He grabbed the horns that stuck out from the upper corners of the altar for burnt offerings.
Once a year Aaron must put the blood of a sin offering on the horns of the altar. He must do this to make the altar pure. He must do this on the day Israel’s sin is paid for. Do this for all time to come. The altar is a very holy place to me.”