Commentaries
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.
2. for she was a virgin—Unmarried daughters were kept in close seclusion from the company of men; no strangers, nor even their relatives of the other sex, being permitted to see them without the presence of witnesses. Of course, Amnon must have seen Tamar, for he had conceived a violent passion for her, which, though forbidden by the law (Le 18:11), yet with the sanction of Abraham's example (Ge 20:12), and the common practice in neighboring countries for princes to marry their half sisters, he seems not to have considered an improper connection. But he had no means of making it known to her, and the pain of that disappointment preying upon his mind produced a visible change in his appearance and health.