2 Samuel 13:3-5

3Amnon had a friend named Jonadab, a son of David’s brother Shimeah. Jonadab was a very shrewd man,

4and he asked Amnon, “Why are you, the king’s son, so miserable every morning? Won’t you tell me?” Amnon replied, “I’m in love with Tamar, my brother Absalom’s sister.”

5Jonadab said to him, “Lie down on your bed and pretend you’re sick. 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 a meal in my presence so I can watch and eat from her hand.’”