Jer 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 cistern into which Ishmael had thrown all the bodies of the men he had struck down along with Gedaliah was a large one that King Asa had made for fear of Baasha king of Israel. Ishmael son of Nethaniah filled it with the slain.