28 And news of this came to Joab; for Joab had been one of Adonijah's supporters, though he had not been on Absalom's side. Then Joab went in flight to the Tent of the Lord, and put his hands on the horns of the altar. 29 And they said to King Solomon, Joab has gone in flight to the Tent of the Lord and is by the altar. Then Solomon sent Benaiah, the son of Jehoiada, saying, Go, make an attack on him. 30 And Benaiah came to the Tent of the Lord and said to him, The king says, Come out. And he said, No; but let death come to me here. And Benaiah went back to the king and gave him word of the answer which Joab had given. 31 And the king said, Do as he has said and make an attack on him there, and put his body into the earth; so that you may take away from me and from my family the blood of one put to death by Joab without cause. 32 And the Lord will send back his blood on his head, because of the attack he made on two men more upright and better than himself, putting them to the sword without my father's knowledge; even Abner, the son of Ner, captain of the army of Israel, and Amasa, the son of Jether, captain of the army of Judah. 33 So their blood will be on the head of Joab, and on the head of his seed for ever; but for David and his seed and his family and the seat of his kingdom, there will be peace for ever from the Lord. 34 So Benaiah, the son of Jehoiada, went up, and falling on him, put him to death; and his body was put to rest in his house in the waste land.
Matthew Henry's Commentary on 1 Kings 2:28-34
Commentary on 1 Kings 2:26-34
(Read 1 Kings 2:26-34)
Solomon's words to Abiathar, and his silence, imply that some recent conspiracies had been entered into. Those that show kindness to God's people shall have it remembered to their advantage. For this reason Solomon spares Abiathar's life, but dismisses him from his offices. In case of such sins as the blood of beasts would atone for, the altar was a refuge, but not in Joab's case. Solomon looks upward to God as the Author of peace, and forward to eternity as the perfection of it. The Lord of peace himself gives us that peace which is everlasting.