Jeremiah 41:1-3

But in the seventh month of that same year, Ishmael the son of Nethaniah, and grandson of Elishama, came to Mizpah with ten of his soldiers. He had been one of the king’s officials and was a member of the royal family. Ishmael and his men had a meal together with Gedaliah in Mizpah. Then suddenly Ishmael jumped up with his armed men and killed Gedaliah the son of Ahikam, grandson of Shaphan. They killed Gedaliah, the man whom the king of Babylon had appointed governor in the land. Ishmael also struck down all the Israelites who were with Gedaliah at Mizpah and the Babylonian soldiers who happened to be there.