Albert Barnes Commentary 2 Samuel 12:11

"Thus saith Jehovah, Behold, I will raise up evil against thee out of thine own house; and I will take thy wives before thine eyes, and give them unto thy neighbor, and he shall lie with thy wives in the sight of this sun." — 2 Samuel 12:11 (ASV)

The cross-references show that in both aspects of David’s crime, the retribution corresponded to his sin. His adultery was punished by Absalom’s outrage, and his murder by the bloodshed of family conflicts, which cost the lives of at least three of his favorite sons: Amnon, Absalom, and Adonijah.