Jeremiah 41:1-3

But in midautumn of that year, Ishmael son of Nethaniah and grandson of Elishama, who was a member of the royal family and had been one of the king’s high officials, went to Mizpah with ten men to meet Gedaliah. While they were eating together, Ishmael and his ten men suddenly jumped up, drew their swords, and killed Gedaliah, whom the king of Babylon had appointed governor. Ishmael also killed all the Judeans and the Babylonian soldiers who were with Gedaliah at Mizpah.