2 Samuel 21:5-9

So they said to the king, “The man who destroyed us and who planned to eliminate us so that we would not exist within any border of Israel—

let seven men from his sons be given to us, and we will hang them before the Lord in Gibeah of Saul, the chosen 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 oath of the Lord which was between them, between David and Saul’s son Jonathan.

So the king took the two sons of Rizpah the daughter of Aiah, Armoni and Mephibosheth whom she had borne to Saul, and the five sons of Merab the daughter of Saul, whom she had borne to Adriel the son of Barzillai the Meholathite.

Then he handed them over to the Gibeonites, and they hanged them on the mountain before the Lord, so that the seven of them fell together; and they were put to death in the first days of harvest at the beginning of barley harvest.