Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[13] Now when Joab the captain of the host heard of the slaughter of Adonijah, he was greatly afraid, for he was a greater friend to him than to Solomon; and suspecting, not without reason, that he was in danger, on account of his favor to Adonijah, he fled to the altar, and supposed he might procure safety thereby to himself, because of the king's piety towards God. But when some told the king what Joab's supposal was, he sent Benaiah, and commanded him to raise him up from the altar, and bring him to the judgment-seat, in order to make his defense. However, Joab said he would not leave the altar, but would die there rather than in another place. And when Benaiah had reported his answer to the king, Solomon commanded him to cut off his head there ¹ and let him take that as a punishment for those two captains of the host whom he had wickedly slain, and to bury his body, that his sins might never leave his family, but that himself and his father, by Joab's death, might be guiltless. And when Benaiah had done what he was commanded to do, he was himself appointed to be captain of the whole army. The king also made Zadok to be alone the high priest, in the room of Abiathar, whom he had removed.