Jeremiah 41:2, 3, 7

Ishmael son of Nethaniah and the ten men who were with him got up and struck down Gedaliah son of Ahikam, the son of Shaphan, with the sword, killing the one whom the king of Babylon had appointed as governor over the land.

Ishmael also killed all the men of Judah who were with Gedaliah at Mizpah, as well as the Babylonian soldiers who were there.

When they went into the city, Ishmael son of Nethaniah and the men who were with him slaughtered them and threw them into a cistern.