Jeremiah 41:8-9

8But ten men were found among them who said to Ishmael, “Do not kill us, for we have treasures of wheat, barley, oil, and honey in the field.” So he desisted and did not kill them among their brethren.

9Now the pit into which Ishmael had cast all the dead bodies of the men whom he had slain, because of Gedaliah, was the same one Asa the king had made for fear of Baasha king of Israel. Ishmael the son of Nethaniah filled it with the slain.