Commentary for Jeremiah 41:9

וְהַבּ֗וֹר אֲשֶׁר֩ הִשְׁלִ֨יךְ שָׁ֤ם יִשְׁמָעֵאל֙ אֵ֣ת ׀ כָּל־פִּגְרֵ֣י הָאֲנָשִׁ֗ים אֲשֶׁ֤ר הִכָּה֙ בְּיַד־גְּדַלְיָ֔הוּ ה֗וּא אֲשֶׁ֤ר עָשָׂה֙ הַמֶּ֣לֶךְ אָסָ֔א מִפְּנֵ֖י בַּעְשָׁ֣א מֶֽלֶךְ־יִשְׂרָאֵ֑ל אֹת֗וֹ מִלֵּ֛א יִשְׁמָעֵ֥אל בֶּן־נְתַנְיָ֖הוּ חֲלָלִֽים׃

Now the pit wherein Ishmael cast all the dead bodies of the men whom he had slain by the side of Gedaliah was that which Asa the king had made for fear of Baasa king of Israel; the same Ishmael the son of Nethaniah filled with them that were slain.

Rashi on Jeremiah