Jeremiah 40
15 Ref Then Johanan the son of Kareah spoke to Gedaliah in Mizpah secretly, saying, Please let me go, and I will kill Ishmael the son of Nethaniah, and no man shall know it: why should he take your life, that all the Jews who are gathered to you should be scattered, and the remnant of Judah perish?
16 Ref But Gedaliah the son of Ahikam said to Johanan the son of Kareah, You shall not do this thing; for you speak falsely of Ishmael.