The Outer Trappings Of Piety
הַצִּילֵנִי נָא מִיַּד אָחִי, מִיַּד עֵשָׂו
Deliver me, from the hand of my brother, from the hand of Esav. (Bereishis 32:12)
Degel Machaneh Ephraim, Parshas Vayishlach:
This should be interpreted in accord with that stated in the Midrash: In the future, Esav will wrap himself in tzitzis and sit among the tzaddikim, and Hashem will pull him down from them.
It is important to say that this is also common in this world because of our many sins; for falsehood has increased in the world, and everyone wants to ascend to the level of the completely faithful in Israel. He sees that they are dressed in white clothing on Shabbos and wear a tallis on Erev Shabbos during Mincha and says, "I can surely be like them."
It is this which is more difficult than all else, for this causes the golus to be lengthened: they are called the Erev Rav, for this are mixed in among the Jewish people and it is difficult to separate them. Like wheat: the chaff and straw which is not all that stuck to the wheat is dispersed easily; but the refuse that is in the wheat is attached and it is hard to remove.