Haman Before MaShiach Comes Parashat Tzav

The Sages in Masechet Sanhedrin say, that before MaShiach comes if we don't do TeShuva HaShem will bring a ruler worse than Haman. Rabbi Yaron Reuven brings a priceless chiddush from Parashat Tzav on at first what seems to be simple mitzvot of kashering vessels, but upon closer examination, it holds a secret to who will do TeShuva before MaShiach comes.