וְיֶ֛תֶר דִּבְרֵ֥י אָמ֖וֹן אֲשֶׁ֣ר עָשָׂ֑ה הֲלֹא־הֵ֣ם כְּתוּבִ֗ים עַל־סֵ֛פֶר דִּבְרֵ֥י הַיָּמִ֖ים לְמַלְכֵ֥י יְהוּדָֽה׃
Now the rest of the acts of Amon which he did, are they not written in the book of the chronicles of the kings of Judah?
Read midrashic interpretation of II Kings 21:25: and classical rabbinic exegesis.