2 Samuel 13:2 in the King James Version
And Amnon was so vexed, that he fell sick for his sister Tamar; for she was a virgin; and Amnon thought it hard for him to do any thing to her.
Context
1 After this, Absalom the son of David had a beautiful sister, whose name was Tamar; and Amnon the son of David loved her.
2 Amnon was so troubled that he became sick because of his sister Tamar, for she was a virgin, and it seemed hard to Amnon to do anything to her.
3 But Amnon had a friend whose name was Jonadab the son of Shimeah, David’s brother; and Jonadab was a very subtle man.