Jeremiah 40:15 NKJV

[15] Then Johanan the son of Kareah spoke secretly to Gedaliah in Mizpah, saying, "Let me go, please, and I will kill Ishmael the son of Nethaniah, and no one will know it. Why should he murder you, so that all the Jews who are gathered to you would be scattered, and the remnant in Judah perish?"