2 Samuel 21:8-11

8But the king took the two sons of Rizpah the daughter of Aiah, whom she bare unto Saul, Armoni and Mephibosheth; and the five sons of Michal the daughter of Saul, whom she bare to Adriel the son of Barzillai the Meholathite: 9and he delivered them into the hands of the Gibeonites, and they hanged them in the mountain before Jehovah, and they fell all seven together. And they were put to death in the days of harvest, in the first days, at the beginning of barley harvest.

10And Rizpah the daughter of Aiah took sackcloth, and spread it for her upon the rock, from the beginning of harvest until water was poured upon them from heaven; and she suffered neither the birds of the heavens to rest on them by day, nor the beasts of the field by night. 11And it was told David what Rizpah the daughter of Aiah, the concubine of Saul, had done.