Jeremiah 40:13-16

13Now Johanan the son of Kareah and all the leaders of the forces in the open country came to Gedaliah at Mizpah

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 would not believe them.

15Then Johanan the son of Kareah spoke secretly to Gedaliah at Mizpah, "Please let me go and strike down Ishmael the son of Nethaniah, and no one will know it. Why should he take your life, so that all the Judeans who are gathered about you would be scattered, and the remnant of Judah would perish?"

16But Gedaliah the son of Ahikam said to Johanan the son of Kareah, "You shall not do this thing, for you are speaking falsely of Ishmael."