2 Kings 25:23-25

23Now when all the captains and their men heard that the king of Babylon had appointed Gedaliah governor, they came with their men to Gedaliah at Mizpah, namely, Ishmael the son of Nethaniah, and Johanan the son of Kareah, and Seraiah the son of Tanhumeth the Netophathite, and Jaazaniah the son of the Maacathite.

24And Gedaliah swore to them and their men, saying, "Do not be afraid because of the Chaldean officials. Live in the land and serve the king of Babylon, and it shall be well with you."

25But in the seventh month, Ishmael the son of Nethaniah, son of Elishama, of the royal family, came with ten men and struck down Gedaliah and put him to death along with the Jews and the Chaldeans who were with him at Mizpah.