Jeremiah 40:16 (KJV)

Likewise when all the Jews that were in Moab, and among the Ammonites, and in Edom, and that were in all the countries, heard that the king of Babylon had left a remnant of Judah, and that he had set over them Gedaliah the son of Ahikam the son of Shaphan;

Even all the Jews returned out of all places whither they were driven, and came to the land of Judah, to Gedaliah, unto Mizpah, and gathered wine and summer fruits very much.

Moreover Johanan the son of Kareah, and all the captains of the forces that were in the fields, came to Gedaliah to Mizpah,

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.

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?