'Horns of the Altar' in the Bible

And Adonijah feared because of Solomon, and arose and went and caught hold on the horns of the altar.

And it was told to Solomon, saying, Behold, Adonijah fears King Solomon. For, lo, he has caught hold on the horns of the altar, saying, Let King Solomon swear to me today that he will not kill his servant with the sword.

And the report came to Joab. For Joab had turned after Adonijah, though he did not turn after Absalom. And Joab fled to the tabernacle of Jehovah, and caught hold on the horns of the altar.