Jeremiah 40:13 KJV

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

A conspiracy against GedaliahJeremiah had never in his prophecies spoken of any good days for the Jews, to come immediately after the captivity; yet Providence seemed to encourage such...

Jeremiah 40:8 Then they came to Gedaliah to Mizpah, even Ishmael the son of Nethaniah, and Johanan and Jonathan the sons of Kareah, and Seraiah the son of Tanhumeth, and the sons of Ephai the Netophathite, and Jezaniah the son of a Maachathite, they and their men.
Jeremiah 42:1 Then all the captains of the forces, and Johanan the son of Kareah, and Jezaniah the son of Hoshaiah, and all the people from the least even unto the greatest, came near,

From OpenBible.info, most relevant first.

Ahikam Son of Shaphan
Gedaliah Warned of the conspiracy of Ishmael by Johanan, and the captains of his army
Ishmael Assassinated Gedaliah, governor of Judah under king of Babylon, and takes many Jews captive
Israel, prophecies concerning Gedaliah was conspired against and assassinated by Ishmael
Johanan Warns Gedaliah against Ishmael
Kareah Father of Johanan
Mizpah Temporarily the capitol of the country after the people of Israel had been carried away captive

Timeline of the Bible629–588 BC · Jeremiah, in the days of Josiah, Jehoiakim, and Zedekiah

JohananWhom Jehovah graciously bestows. (1.) One of the Gadite heroes who joined David in the desert of Judah (1 Chr 12:12).
KareahBald, the father of Johanan and Jonathan, who for a time were loyal to Gedaliah, the Babylonian governor of Jerusalem (Jer 40:8, Jer...
GedaliahMade great by Jehovah. (1.) the son of Jeduthum (1 Chr 25:3, 1 Chr 25:9). (2.) The grandfather of the prophet Zephaniah, and the father...
MizpahOr Miz’peh, watch-tower; the look-out. (1.) A place in Gilead, so named by Laban, who overtook Jacob at this spot (Gen 31:49) on his...

Moreover Johanan וְיוֹחָנָן wĕyôḥānān יוֹחָנָן Proper name · with and
the son בֶּן ben בֵּן Noun · masculine singular construct
of Kareah קָרֵחַ qārēaḥ קָרֵחַ Proper name
and all the captains וְכָל wĕkol Noun · masculine singular construct · with and שָׂרֵי śārê שַׂר Noun · masculine plural construct
of the forces הַחֲיָלִים haḥăyālîm חַיִל Noun · masculine plural · with the
that were in the fields אֲשֶׁר ʾăšer Relative בַּשָּׂדֶה baśśādê שָׂדֶה Noun · masculine singular · with preposition with the
came בָּאוּ bāʾww בּוֹא Verb · qal perfect, third person common plural
to Gedaliah אֶל ʾel Preposition גְּדַלְיָהוּ gĕdalyāhû גְּדַּלְיָה Proper name
to Mizpah הַמִּצְפָּתָה hammiṣpātâ מִצְפֶּה Proper name · with the, ending: toward

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