Jeremiah 40:14-15

14They said to him, “Did you know that Baalis, king of Ammon, has sent Ishmael son of Nethaniah to assassinate you?” But Gedaliah refused to believe them.

15Later Johanan had a private conference with Gedaliah and volunteered to kill Ishmael secretly. “Why should we let him come and murder you?” Johanan asked. “What will happen then to the Judeans who have returned? Why should the few of us who are still left be scattered and lost?”