Jeremiah 41:1-3

In the seventh month Ishmael son of Nethaniah, the son of Elishama, who was of royal blood and had been one of the king’s officers, came with ten men to Gedaliah son of Ahikam at Mizpah. While they were eating together there, 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.