28 When this news reached Joab, this Joab who had conspired with Adonijah (although he had remained loyal in the Absalom affair), he took refuge in the sanctuary of God, seizing the horns of the Altar and holding on for dear life. 29 King Solomon was told that Joab had escaped to the sanctuary of God and was clinging to the Altar; he immediately sent Benaiah son of Jehoiada with orders, "Kill him." 30 Benaiah went to the sanctuary of God and said, "King's orders: Come out." He said, "No - I'll die right here." Benaiah went back to the king and reported, "This was Joab's answer." 31 The king said, "Go ahead then, do what he says: Kill him and bury him. Absolve me and my father's family of the guilt from Joab's senseless murders. 32 God is avenging those bloody murders on Joab's head. Two men he murdered, men better by far than he ever was: Behind my father's back he brutally murdered Abner son of Ner, commander of Israel's army, and Amasa son of Jether, commander of Judah's army. 33 Responsibility for their murders is forever fixed on Joab and his descendants; but for David and his descendants, his family and kingdom, the final verdict is God's peace." 34 So Benaiah son of Jehoiada went back, struck Joab, and killed him. He was buried in his family plot out in the desert.
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.