Jeremiah 41:9-12

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.

10Then Ishmael carried away captive all the rest of the people who were in Mizpah, the king’s daughters and all the people who remained in Mizpah, whom Nebuzaradan the captain of the guard had committed to Gedaliah the son of Ahikam. And Ishmael the son of Nethaniah carried them away captive and departed to go over to the Ammonites.

11But when 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,

12they took all the men and went to fight with Ishmael the son of Nethaniah; and they found him by the great pool that is in Gibeon.