Jeremiah 40:14-15

14and said to him, “Do you know that Baalis the king of the Ammonites has sent Ishmael the son of Nethaniah to take your life?” But Gedaliah the son of Ahikam did not believe them.

15Then Johanan the son of Kareah spoke secretly to Gedaliah in Mizpah, saying, “Let me go and kill Ishmael the son of Nethaniah, and not a man will know [who is responsible]. Why should he kill you and cause all the Jews who are gathered near you to be scattered and the remnant of Judah to perish?”