Jeremiah 41:8-9

8The other ten had talked Ishmael into letting them go by promising to bring him their stores of wheat, barley, olive oil, and honey that they had hidden away.

9The cistern where Ishmael dumped the bodies of the men he murdered was the large one dug by King Asa when he fortified Mizpah to protect himself against King Baasha of Israel. Ishmael son of Nethaniah filled it with corpses.