II Samuel 13:4

4 He asked Amnon, "Why do you, the king's son, look so haggard morning after morning? Won't you tell me?" Amnon said to him, "I'm in love with Tamar, my brother Absalom's sister."

4 And he said to him, O son of the king, why are you getting thinner day by day? will you not say what your trouble is? And Amnon said to him, I am in love with Tamar, my brother Absalom's sister.