Logician, there are numerous sources that the time of the Redemption is going to be a time of great judgement. May HaShem have mercy on the Yidden! The Zohar says there is going to be a makka to kill out those Jews who do not want Moshiach to come. “And who can bear the day of his coming, and who will stand when he is revealed…”(Malachi).
Josh31, 80% of the Jews were killed during makas choshech.