2 Samuel 13:2-4

Darby Translation

² And Amnon was so vexed, that he fell sick for his sister Tamar; for she was a virgin; and it seemed difficult for Amnon to do the least thing to her.

³ And Amnon had a friend whose name was Jonadab, the son of Shimeah David's brother; and Jonadab was a very shrewd man.

⁴ And he said to him, Why dost thou, the king's son, get thinner from morning to morning? Wilt thou not tell me? And Amnon said to him, I love Tamar, my brother Absalom's sister.