2 Samuel 21:8-9

8But the king took Armoni and Mephibosheth, the two sons of Aiah’s daughter Rizpah, whom she had borne to Saul, together with the five sons of Saul’s daughter Merab, whom she had borne to Adriel son of Barzillai the Meholathite.

9He handed them over to the Gibeonites, who killed them and exposed their bodies on a hill before the Lord. All seven of them fell together; they were put to death during the first days of the harvest, just as the barley harvest was beginning.