JER 40:15

15 Forsooth Johanan, the son of Kareah, said to Gedaliah asides half in Mizpah, and spake, I shall go, and slay Ishmael, the son of Nethaniah, while no man knoweth, lest he slay thy life, and all the Jews be scattered, that be gathered to thee, and the remnants of Judah shall perish.