וַיַּצִּ֧בוּ לָהֶ֛ם מַצֵּב֖וֹת וַאֲשֵׁרִ֑ים עַ֚ל כָּל־גִּבְעָ֣ה גְבֹהָ֔ה וְתַ֖חַת כָּל־עֵ֥ץ רַעֲנָֽן׃
and they set them up pillars and Asherim upon every high hill, and under every leafy tree;
Read midrashic interpretation of II Kings 17:10: and classical rabbinic exegesis.