2 Samuel 13:2-4

21st Century King James Version

² 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.

³ But Amnon had a friend whose name was Jonadab, the son of Shimeah David’s brother; and Jonadab was a very subtle man.

⁴ And he said unto him, “Why art thou, being the king’s son, lean from day to day? Wilt thou not tell me?” And Amnon said unto him, “I love Tamar, my brother Absalom’s sister.”