2 Samuel 21:8-9

8But the king took Armoni and Mephibosheth, who were the two sons whom Rizpah daughter of Aiah had borne to Saul, and the five sons whom Merab daughter of Saul had borne to Adriel son of Barzillai the Meholathite

9and handed them over to the Gibeonites. They hanged them on the hill in the presence of the Lord; the seven of them died together. They were executed in the first days of the harvest at the beginning of the barley harvest.