Musar for Megillah 13:26

The second period: During the period of the Persian and Median empires, the lifetime of Mordechai, the redemption under the aegis of the domain חקיקה commenced. The period is characterised by רוח הקודש, holy spirit which is rooted in that domain, just as Moses' prophecy was rooted in the domain רשימו. That this indeed is so, is alluded to in Midrash Rabbah on Mordechai and Esther, which describes the Holy Spirit available at that time as "below," compared to the Holy Spirit avaiable at the time of Moses which is called "above." The Midrash expresses this in connection with Esther 9,27: קימו וקבלו היהודים עליהם ועל זרעם, "The Jews confirmed and undertook upon themselves and their future generations to observe the days of Purim, etc." The Midrash interprets the words קימו וקבלו to mean "they preserved above what they had accepted below." How do we know that Mordechai himself possessed רוח הקודש? Our sages said that the whole Book of Esther was composed under the influence of the Holy Spirit. (Megillah 7a).