After some time, David’s son Amnon fell in love with Tamar, the beautiful sister of David’s son Absalom.
We have here a particular account of the abominable wickedness of Amnon in ravishing his sister, a subject not fit to be enlarged upon nor indeed to be mentioned without blushing, that ever any man should be so vile, especially that a son of David should be so.
Commenting on 2 Samuel 13:1-20
And it came to pass after this,.... After the sin of David with Bathsheba, his repentance for it, and pardon of it, and the birth of Solomon as a token of reconciliation; yet after all this the divine threatenings must take place; they had begun already in the death of the child begotten in adultery, and others here follow: that Absalom the son of David...
And it came to pass after this, that Absalom the son of David had a fair sister, whose name [was] Tamar; and Amnon the son of David loved her. (a) Tamar was Absalom's sister both by father and mother, and Amnon's only by father.