קבלה אויף מלכים א 12:28

On the “other side”, the side which is not holy, there is also a king, the one who is called “an old king and a fool” (Eccl. 4, 13), and the priest, who is under him and ministers to him, is On (=aven, nothingness, idolatry); he is alluded to in the verse: “And Ephraim said, Yet I am become rich, I have found me out power”, namely, the celestial unholy power which presided over the act of idolatry committted by Jeroboam (I Kings 12, 28), without which he would not have been able to succeed.