Jeremiah 40:15

15 Then Johanan the son of Kareah spoke to Gedaliah in Mizpah secretly, saying, "Let me go, I pray thee, and I will slay Ishmael the son of Nethaniah, and no man shall know it. Why should he slay thee, that all the Jews who are gathered unto thee should be scattered and the remnant in Judah perish?"