2 Samuel 13:1-3

Amnon and Tamar 1In the course of time, Amnon son of David fell in love with Tamar, the beautiful sister of Absalom son of David.

2Amnon became so obsessed with his sister Tamar that he made himself ill. She was a virgin, and it seemed impossible for him to do anything to her. 3Now Amnon had an adviser named Jonadab son of Shimeah, David’s brother. Jonadab was a very shrewd man.