28 Absalom told his men, "Wait until Amnon gets drunk; then at my signal, kill him! Don't be afraid. I'm the one who has given the command. Take courage and do it!" 29 So at Absalom's signal they murdered Amnon. Then the other sons of the king jumped on their mules and fled.
30 As they were on the way back to Jerusalem, this report reached David: "Absalom has killed all the king's sons; not one is left alive!" 31 The king got up, tore his robe, and threw himself on the ground. His advisers also tore their clothes in horror and sorrow. 32 But just then Jonadab, the son of David's brother Shimea, arrived and said, "No, don't believe that all the king's sons have been killed! It was only Amnon! Absalom has been plotting this ever since Amnon raped his sister Tamar. 33 No, my lord the king, your sons aren't all dead! It was only Amnon." 34 Meanwhile Absalom escaped. Then the watchman on the Jerusalem wall saw a great crowd coming down the hill on the road from the west. He ran to tell the king, "I see a crowd of people coming from the Horonaim road along the side of the hill." 35 "Look!" Jonadab told the king. "There they are now! The king's sons are coming, just as I said." 36 They soon arrived, weeping and sobbing, and the king and all his servants wept bitterly with them. 37 And David mourned many days for his son Amnon. Absalom fled to his grandfather, Talmai son of Ammihud, the king of Geshur. 38 He stayed there in Geshur for three years.
Matthew Henry's Commentary on 2 Samuel 13:28-38
Commentary on 2 Samuel 13:21-29
(Read 2 Samuel 13:21-29)
Observe the aggravations of Absalom's sin: he would have Ammon slain, when least fit to go out of the world. He engaged his servants in the guilt. Those servants are ill-taught who obey wicked masters, against God's commands. Indulged children always prove crosses to godly parents, whose foolish love leads them to neglect their duty to God.
Commentary on 2 Samuel 13:30-39
(Read 2 Samuel 13:30-39)
Jonadab was as guilty of Ammon's death, as of his sin; such false friends do they prove, who counsel us to do wickedly. Instead of loathing Absalom as a murderer, David, after a time, longed to go forth to him. This was David's infirmity: God saw something in his heart that made a difference, else we should have thought that he, as much as Eli, honoured his sons more than God.