2 Samuel 3:35
3:35 Then all the people came and encouraged David to eat food while it was still day. But David took an oath saying, “God will punish me severely if I taste bread or anything whatsoever before the sun sets!”
2 Samuel 13:2
13:2 But Amnon became frustrated because he was so lovesick over his sister Tamar. For she was a virgin, and to Amnon it seemed out of the question to do anything to her.