The recitation of Selichot -- a series of penitential prayers recited daily in preparation for the Days of Awe , reaches its climax with the recitation of the "Zechor Brit" "Remember Your Covenant" Selichot on the day before Rosh Hashanah.
Perhaps counter-intuitively, the tachanun confessional sections of the prayers is omitted from the day's morning prayers, as is done on all festive dates on the Jewish calendar. After all, it is the day before a holiday, and we are confident and certain that G‑d will judge us favorably and bless each and every one of His children with a sweet and happy new year!
The shofar is not sounded on the day before Rosh Hashanah (as it is every day throughout the previous month of Elul), to separate between the shofar soundings of the month of Elul -- which are a min hag, or "custom" and the Rosh Hashanah soundings, which are a biblically ordained mi ,Another reason given for not sounding the shofar on this day is in order to confuse Satan, the supernal prosecutor, as he prepares his case against us for tomorrow's Day of Judgment. The blowing of the shofar is a great weapon in our arsenal, as it is symbolic of the horn of the ram which was sacrificed in stead of Isaac, and thus evokes the merit of our holy Patriarchs and the sacrifices they made out of their deep love for G‑d. When Satan sees that we are so confident that we will be victorious on the Day of Judgment that we don't even find it necessary any more to sound the shofar, he is utterly confounded and loses confidence in his carefully prepared case.
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