2 Samuel 21:5-7

They said to the king, “The man who consumed us and planned to destroy us, so that we should have no place in all the territory of Israel, let seven of his sons be given to us, so that we may hang them before the LORD at Gibeah of Saul, the chosen of the LORD.” And the king said, “I will give them.” But the king spared Mephibosheth, the son of Saul’s son Jonathan, because of the oath of the LORD that was between them, between David and Jonathan the son of Saul.