2 Samuel 13:1-2

New International Version

Amnon and Tamar

13 In the course of time, Amnon^(A) son of David fell in love with Tamar,^(B) the beautiful sister of Absalom^(C) son of David.

² Amnon 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.