Jeremiah 40:15 in the World English Bible
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 will 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?”
Context
14 And said unto him, Dost thou certainly know that Baalis the king of the Ammonites hath sent Ishmael the son of Nethaniah to slay thee? But Gedaliah the son of Ahikam believed them not.
15 Then Johanan the son of Kareah spake to Gedaliah in Mizpah secretly, saying, Let me go, I pray thee, and I will slay Ishmael the son of Nethaniah, and no man shall know it: wherefore should he slay thee, that all the Jews which are gathered unto thee should be scattered, and the remnant in Judah perish?
16 But Gedaliah the son of Ahikam said unto Johanan the son of Kareah, Thou shalt not do this thing: for thou speakest falsely of Ishmael.