Jeremiah 41:7

41:7 But as soon as they were inside the city, Ishmael son of Nethaniah and the men who were with him slaughtered them and threw their bodies in a cistern.

Jeremiah 41:11-12

Johanan Rescues the People Ishmael Had Carried Off

41:11 Johanan son of Kareah and all the army officers who were with him heard about all the atrocities that Ishmael son of Nethaniah had committed. 41:12 So they took all their troops and went to fight against Ishmael son of Nethaniah. They caught up with him near the large pool at Gibeon.