2 Samuel 21:5-7

And they answered the king, The man that consumed us, and that devised against us that we should be destroyed from remaining in any of the coasts of Israel, let seven men of his sons be delivered unto us, and we will hang them up unto the LORD in Gibeah of Saul, whom the LORD did choose. 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 them, between David and Jonathan the son of Saul.