Jeremiah 41:9-12

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

10And Ishmael carried away captive all the remnant of the people that were in Mizpah, the king's daughters, and all the people that remained in Mizpah, whom Nebuzar-adan the captain of the body-guard had committed to Gedaliah the son of Ahikam: Ishmael the son of Nethaniah carried them away captive, and departed to go over to the children of Ammon.

11And Johanan the son of Kareah, and all the captains of the forces that were with him, heard of all the evil that Ishmael the son of Nethaniah had done;

12and they took all the men, and went to fight with Ishmael the son of Nethaniah, and found him by the great waters that are at Gibeon.