2 Samuel 21:5-7

So they said to the king, “The man who consumed us and planned to exterminate us from remaining in any territory of Israel, let seven men [chosen] from his sons (descendants) be given to us and we will hang them before the LORD [that is, put them on display, impaled with broken legs and arms] in Gibeah of Saul, the chosen one of the LORD.” And the king said, “I will give them.” But the king spared Mephibosheth the son of Jonathan, the son of Saul, because of the LORD’S oath that was between David and Saul’s son Jonathan.