11 So Joab said to the man who told him, "You just saw him! And why did you not strike him there to the ground? I would have given you ten shekels of silver and a belt." 12 But the man said to Joab, "Though I were to receive a thousand shekels of silver in my hand, I would not raise my hand against the king's son. For in our hearing the king commanded you and Abishai and Ittai, saying, 'Beware lest anyone touch the young man Absalom!' 13 Otherwise I would have dealt falsely against my own life. For there is nothing hidden from the king, and you yourself would have set yourself against me." 14 Then Joab said, "I cannot linger with you." And he took three spears in his hand and thrust them through Absalom's heart, while he was still alive in the midst of the terebinth tree. 15 And ten young men who bore Joab's armor surrounded Absalom, and struck and killed him.
Matthew Henry's Commentary on 2 Samuel 18:11-15
Commentary on 2 Samuel 18:9-18
(Read 2 Samuel 18:9-18)
Let young people look upon Absalom, hanging on a tree, accursed, forsaken of heaven and earth; there let them read the Lord's abhorrence of rebellion against parents. Nothing can preserve men from misery and contempt, but heavenly wisdom and the grace of God.