20 And her brother Ab'salom said to her, "Has Amnon your brother been with you? Now hold your peace, my sister; he is your brother; do not take this to heart." So Tamar dwelt, a desolate woman, in her brother Ab'salom's house.
21 When King David heard of all these things, he was very angry. 22 But Ab'salom spoke to Amnon neither good nor bad; for Ab'salom hated Amnon, because he had forced his sister Tamar.
Matthew Henry's Commentary on 2 Samuel 13:20-22
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.