Then Jonadab the son of Shimeah, David's brother, answered and said, "Let not my lord suppose they have killed all the young men, the king's sons, for only Amnon is dead. For by the command of Absalom this has been determined from the day that he forced his sister Tamar.
2 Samuel 13:32
Surrounding context
13:31 So the king arose and tore his garments and lay on the ground, and all his servants stood by with their clothes torn.
13:32 Then Jonadab the son of Shimeah, David's brother, answered and said, "Let not my lord suppose they have killed all the young men, the king's sons, for only Amnon is dead. For by the command of Absalom this has been determined from the day that he forced his sister Tamar.
13:33 Now therefore, let not my lord the king take the thing to his heart, to think that all the king's sons are dead. For only Amnon is dead."