II Samuel 13:32

32 But Jonadab son of Shimeah, David's brother, said, "My lord should not think that they killed all the princes; only Amnon is dead. This has been Absalom's express intention ever since the day Amnon raped his sister Tamar.

32 And Jonadab, the son of Shimeah, David's brother, said, Let not my lord have the idea that all the sons of the king have been put to death; for only Amnon is dead: this has been purposed by Absalom from the day when he took his sister Tamar by force.