2 Samuel 13:32

Let not my lord suppose, &c. A practical illustration of the sagacity for which Jonadab was famous (2 Samuel 13:3). He at once rejects the exaggerations of rumour, and predicts accurately what had really happened.

by the appointment of Absalom this hath been determined Lit., upon Absalom's mouth hath it been set; that is, Absalom's sinister looks have all along betrayed his determination to kill Amnon; or, his purpose has been obvious from his words; but the latter explanation is less likely, as Absalom seems to have dissembled his revenge in order to disarm Amnon's suspicion.