וַיֵּ֜לֶךְ בְּדֶ֣רֶךְ ׀ מַלְכֵ֣י יִשְׂרָאֵ֗ל כַּאֲשֶׁ֤ר עָשׂוּ֙ בֵּ֣ית אַחְאָ֔ב כִּ֚י בַּת־אַחְאָ֔ב הָ֥יְתָה לּ֖וֹ אִשָּׁ֑ה וַיַּ֥עַשׂ הָרַ֖ע בְּעֵינֵ֥י יְהוָֽה׃
And he walked in the way of the kings of Israel, as did the house of Ahab; for he had the daughter of Ahab to wife; and he did that which was evil in the sight of the LORD.
Read midrashic interpretation of II Chronicles 21:6: and classical rabbinic exegesis.