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 19:13

19:13 Say to Amasa, ‘Are you not my flesh and blood? God will punish me severely, if from this time on you are not the commander of my army in place of Joab!’”