11 Joab said to the man who told him, "What, you saw him! Why then did you not strike him there to the ground? I would have been glad to give you ten pieces of silver and a belt." 12 But the man said to Joab, "Even if I felt in my hand the weight of a thousand pieces of silver, I would not reach out my hand against the king's son, for in our hearing the king commanded you and Abishai and Ittai, 'For my sake protect the young man Absalom.' 13 On the other hand, if I had dealt treacherously against his life[1] (and there is nothing hidden from the king), then you yourself would have stood aloof." 14 Joab said, "I will not waste time like this with you." And he took three javelins in his hand and thrust them into the heart of Absalom while he was still alive in the oak. 15 And ten young men, Joab's armor-bearers, surrounded Absalom and struck him 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.