I Kings 14:23 Midrash

וַיִּבְנ֨וּ גַם־הֵ֧מָּה לָהֶ֛ם בָּמ֥וֹת וּמַצֵּב֖וֹת וַאֲשֵׁרִ֑ים עַ֚ל כָּל־גִּבְעָ֣ה גְבֹהָ֔ה וְתַ֖חַת כָּל־עֵ֥ץ רַעֲנָֽן׃

For they also built them high places, and pillars, and Asherim, on every high hill, and under every leafy tree;