20 And her brother Absalom said to her, Has your brother Amnon been with you? but now, let there be an end to your crying, my sister: he is your brother, do not take this thing to heart. So Tamar went on living uncomforted in her brother's house.
21 But when King David had news of all these things he was very angry; but he did not make trouble for Amnon his son, for he was dear to David, being his oldest son.
Matthew Henry's Commentary on 2 Samuel 13:20-21
Commentary on 2 Samuel 13:1-20
(Read 2 Samuel 13:1-20)
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.
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.