2 Samuel 13:3-5

3Now Amnon had a friend named Jonadab, the son of David’s brother Shimeah.1 Jonadab was a very shrewd man, 4and he asked Amnon, “Why are you, the son of the king, so depressed morning after morning? Won’t you tell me?”

Amnon replied, “I am in love with Tamar, my brother Absalom’s sister.”

5Jonadab told him, “Lie down on your bed and pretend you are ill. When your father comes to see you, say to him, ‘Please let my sister Tamar come and give me something to eat. Let her prepare it in my sight so I may watch her and eat it from her hand.’”