2 Samuel 21:8-9

8But the king took the two sons of Rizpah daughter of Aiah, whom she bore to Saul—Armoni and Mephibosheth; also the five sons of Michal daughter of Saul, whom she bore to Adriel son of Barzillai the Meholathite,

9and he gave them into the hands of the Gibeonites. So they hanged them on the hill before Adonai, so that all seven fell together. They were put to death during the days of harvest, at the beginning of barley harvest.