2 Samuel 13:3-5

But Amnon had a friend, whose name was Jonadab, the son of Shimeah, David’s brother. And Jonadab was a very crafty man. And he said to him, “O son of the king, why are you so haggard morning after morning? Will you not tell me?” Amnon said to him, “I love Tamar, my brother Absalom’s sister.” Jonadab said to him, “Lie down on your bed and pretend to be ill. And when your father comes to see you, say to him, ‘Let my sister Tamar come and give me bread to eat, and prepare the food in my sight, that I may see it and eat it from her hand.’”