Jonadab was a man of great craft and subtlety, and one that had exact knowledge of Amnon's fact, and of Absalom's temper. By the appointment, or, by the command; Heb. mouth, put for command, Numbers 3:16. From the day; it was resolved from that time in his breast; but the word of command was not then given to others, for that would probably have hindered his design. But all this he seems to have spoken from a probable conjecture, rather than of certain knowledge, as appears by the sequel.
Related Commentaries of 2 Samuel 13:32
2 Samuel 13:32
32 And Jonadab, the son of Shimeah David's brother, answered and said, Let not my lord suppose that they have slain all the young men the king's sons; for Amnon only is dead: for by the appointmentg of Absalom this hath been determined from the day that he forced his sister Tamar.