Jeremiah 41:8-9

8But ten men were found among them that said to Ishmael, Slay us not: for we have treasures in the field, of wheat, and of barley, and of oil, and of honey. So he left them alone, and slew them not 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 that which Asa the king had made for fear of Baasha king of Israel: and Ishmael the son of Nethaniah filled it with them that were slain.1