2 Samuel 13:1-6

And it came to pass after this, that Absalom the son of David had a fair sister, whose name was Tamar; and Amnon the son of David loved her. And Amnon was so vexed that he fell sick because of his sister Tamar; for she was a virgin; and it seemed hard to Amnon to do anything unto her. But Amnon had a friend, whose name was Jonadab, the son of Shimeah, David’s brother: and Jonadab was a very subtle man. And he said unto him, Why, O son of the king, art thou thus lean from day to day? wilt thou not tell me? And Amnon said unto him, I love Tamar, my brother Absalom’s sister. And Jonadab said unto him, Lay thee down on thy bed, and feign thyself sick: and when thy father cometh to see thee, say unto him, Let my sister Tamar come, I pray thee, and give me bread to eat, and dress the food in my sight, that I may see it, and eat it from her hand. So Amnon lay down, and feigned himself sick: and when the king was come to see him, Amnon said unto the king, Let my sister Tamar come, I pray thee, and make me a couple of cakes in my sight, that I may eat from her hand.