2 Kings 25:22-23, 25

Regarding the common people who were left behind in Judah, this: Nebuchadnezzar king of Babylon appointed Gedaliah son of Ahikam, the son of Shaphan, as their governor. When veteran army officers among the people heard that the king of Babylon had appointed Gedaliah, they came to Gedaliah at Mizpah. Among them were Ishmael son of Nethaniah, Johanan son of Kareah, Seraiah son of Tanhumeth the Netophathite, Jaazaniah the son of the Maacathite, and some of their followers.

Some time later—it was in the seventh month—Ishmael son of Nethaniah, the son of Elishama (he had royal blood in him), came back with ten men and killed Gedaliah, the traitor Jews, and the Babylonian officials who were stationed at Mizpah—a bloody massacre.