וְאֵ֣ת כָּל־הַיְּהוּדִ֗ים אֲשֶׁר־הָי֨וּ אִתּ֤וֹ אֶת־גְּדַלְיָ֙הוּ֙ בַּמִּצְפָּ֔ה וְאֶת־הַכַּשְׂדִּ֖ים אֲשֶׁ֣ר נִמְצְאוּ־שָׁ֑ם אֵ֚ת אַנְשֵׁ֣י הַמִּלְחָמָ֔ה הִכָּ֖ה יִשְׁמָעֵֽאל׃
Ishmael also slew all the Jews that were with him, even with Gedaliah, at Mizpah, and the Chaldeans that were found there, even the men of war.
Read midrashic interpretation of Jeremiah 41:3: and classical rabbinic exegesis.