Yom Kippur
Confession

As confession is a core aspect of repentance, confession (or vidui) is a major part of the Yom Kippur prayer services. A confession is recited ten times on Yom Kippur, twice in each of the five standard prayers. In each prayer service, the confession is recited once by the individual in their silent prayer, and again communally during the cantor's repetition of the Amidah. (The Maariv prayer has no repetition, so the second confession is instead recited in the communal Selichot recitation which follows the silent prayer.) Confession is recited an 11th time by individuals in the Mincha prayer of Yom Kippur eve, before the beginning of the holiday.

The Yom Kippur confession text consists of two parts: a short confession beginning with the word Ashamnu (אשמנו, 'we have sinned'), which is a series of words describing sin arranged according to the aleph-bet (Hebrew alphabetic order), and a long confession, beginning with the words Al Cheyt (על חטא, 'for the sin'), which is a set of 22 double acrostics, also arranged according to the aleph-bet, enumerating a range of sins.
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