Ammon's violence to his sister. (1-20) Absalom murders his brother Ammon. (21-29) David's grief, Absalom flees to Geshur. (30-39)
Verses 1-20 From henceforward David was followed with one trouble after another. Adultery and murder were David's sins, the like sins among his children were the beginnings of his punishment: he was too indulgent to his children. Thus David might trace the sins of his children to his own misconduct, which must have made the anguish of the chastisement worse. Let no one ever expect good treatment from those who are capable of attempting their seduction; but it is better to suffer the greatest wrong than to commit the least sin.
Verses 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.
Verses 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.
This chapter relates some of the evils that were to arise out of David's house, and which were similar to the evils committed by him; the deflowering of his daughter, and the murder of his eldest son: the story is this; Amnon falls in love with Tamar, his sister, and grew thin upon it, which being observed by a friend of his, inquires the reason of it, which having got out of him, forms a scheme for obtaining his desire, and which succeeded; for by it he had the opportunity of ravishing his sister, 2Sa 13:1-14; the consequences of which were extreme hatred of her, hurrying her out of doors, lamentation and mourning on her part, grief to David, and enmity in the heart of Absalom to Amnon, which put him upon meditating his death, 2Sa 13:15-22; and which was brought about after this manner. Absalom had a sheep shearing, to which he invited the king and all his sons, and to which they all came excepting the king, 2Sa 13:23-27; when Absalom gave orders to his servants to observe Amnon when he was merry, and at his word smite him and kill him, as they did, 2Sa 13:28,29; tidings of which soon came to the ears of David, and these aggravated, that all the king's sons were killed, which threw the king into an agony; but Jonadab endeavoured to pacify him, by assuring him that only Amnon was dead, the truth of which soon appeared by the coming of the king's sons, 2Sa 13:30-36; but Absalom fled to Geshur, where he remained three years, when David's heart began to be towards him, and to long for him, who was to bring more evil against him, 2Sa 13:37-39.