2 Samuel 13:32

13:32 Jonadab, the son of David’s brother Shimeah, said, “My lord should not say, ‘They have killed all the young men who are the king’s sons.’ For only Amnon is dead. This is what Absalom has talked about from the day that Amnon humiliated his sister Tamar.

2 Samuel 13:1

The Rape of Tamar

13:1 Now David’s son Absalom had a beautiful sister named Tamar. In the course of time David’s son Amnon fell madly in love with her.

2 Samuel 16:9

16:9 Then Abishai son of Zeruiah said to the king, “Why should this dead dog curse my lord the king? Let me go over and cut off his head!”