Jeremiah 41:9-12

9Now the cistern where Ishmael had thrown all the corpses of the men he had struck down was a large one that King Asa had made in the encounter with King Baasha of Israel. Ishmael son of Nethaniah filled it with the slain.

10Then Ishmael took captive all the rest of the people of Mizpah including the daughters of the king — all those who remained in Mizpah over whom Nebuzaradan, captain of the guards, had appointed Gedaliah son of Ahikam. Ishmael son of Nethaniah took them captive and set off to cross over to the Ammonites.

11When Johanan son of Kareah and all the commanders of the armies with him heard of all the evil that Ishmael son of Nethaniah had done,

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