28 Then Ab'salom commanded his servants, "Mark when Amnon's heart is merry with wine, and when I say to you, 'Strike Amnon,' then kill him. Fear not; have I not commanded you? Be courageous and be valiant." 29 So the servants of Ab'salom did to Amnon as Ab'salom had commanded. Then all the king's sons arose, and each mounted his mule and fled.
Matthew Henry's Commentary on 2 Samuel 13:28-29
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.