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 ¹  if I taste bread or anything whatsoever before the sun sets!”

2 Samuel 21:7

21:7 The king had mercy on Mephibosheth son of Jonathan, the son of Saul, in light of the Lord’s oath that had been taken between David and Jonathan son of Saul.

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¹ tn Heb “Thus God will do to me and thus he will add.”