Strong's Concordance H3110
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2Ki 25:23 And when all the captains of the armies, they and their men, heard that the king of Babylon had made Gedaliah governor, there came to Gedaliah to Mizpah, even Ishmael the son of Nethaniah, and JohananH3110 the son of Careah, and Seraiah the son of Tanhumeth the Netophathite, and Jaazaniah the son of a Maachathite, they and their men.
Jer 40:15 Then JohananH3110 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?
Jer 41:16 Then took JohananH3110 the son of Kareah, and all the captains of the forces that were with him, all the remnant of the people whom he had recovered from Ishmael the son of Nethaniah, from Mizpah, after that he had slain Gedaliah the son of Ahikam, even mighty men of war, and the women, and the children, and the eunuchs, whom he had brought again from Gibeon: