Yom Kippur is probably the most important holiday of the Jewish year. Many Jews who do not observe any other Jewish custom will refrain from work, fast and/or attend synagogue services on this day. Yom Kippur occurs on the 10th day of Tishri. The holiday is instituted at Leviticus 23,26 and following.
The name "Yom Kippur" means Day of Atonement, and that pretty much explains what the holiday is. It is a day set aside to "afflict the soul", to atone for the sins of the past year. In Days of Awe, we mentioned the "books" in which God inscribes all of our names. On Yom Kippur, the judgment entered in these books is sealed. This day is, essentially, your last appeal, your last chance to change the judgment, to demonstrate your repentance and make amends.
As noted in Days of Awe, Yom Kippur atones only for sins between man and God, not for sins against another person. To atone for sins against another person, you must first seek reconciliation with that person, righting the wrongs you committed against them if possible. That must all be done before Yom Kippur.
Yom Kippur is a complete Sabbath; no work can be performed on that day. It is well-known that you are supposed to refrain from eating and drinking (even water) on Yom Kippur. It is a complete, 25-hour fast beginning before sunset on the evening before Yom Kippur and ending after nightfall on the day of Yom Kippur. The Talmud also specifies additional restrictions that are less well-known: washing and bathing, anointing one's body (with cosmetics, deodorants, etc.), wearing leather shoes (Orthodox Jews routinely wear canvas sneakers under their dress clothes on Yom Kippur), and engaging in sexual relations are all prohibited on Yom Kippur.
As always, any of these restrictions can be lifted where a threat to life or health is involved. In fact, children under the age of nine and women in childbirth (from the time labor begins until three days after birth) are not permitted to fast, even if they want to. Older children and women from the third to the seventh day after childbirth are permitted to fast, but are permitted to break the fast if they feel the need to do so. People with other illnesses should consult a physician and a rabbi for advice.
Most of the holiday is spent in the synagogue, in prayer. In Orthodox synagogues, services begin early in the morning (8 or 9 AM) and continue until about 3 PM. People then usually go home for an afternoon nap and return around 5 or 6 PM for the afternoon and evening services, which continue until nightfall. The services end at nightfall, with the blowing of the tekiah gedolah, a long blast on the shofar. See Rosh Hashanah for more about the shofar and its characteristic blasts.
It is customary to wear white on the holiday, which symbolizes purity and calls to mind the promise that our sins shall be made as white as snow (Isaiah 1,18).
See also Jewish Liturgy generally.
The evening service that begins Yom Kippur is commonly known as Kol Nidre, named for the prayer that begins the service. "Kol nidre" means all vows, and in this prayer, we ask God to annul all vows we may have made in the past year and all vows we may make in the next year.
This prayer has often been held up by anti-Semites as proof that Jews are untrustworthy (we do not keep our vows), and for this reason the Reform movement removed it from the liturgy for a while. In fact, the reverse is true: we make this prayer because we take vows so seriously that we consider ourselves bound even if we make the vows under duress or in times of stress when we are not thinking as well as we should. This prayer gave comfort to those who were converted to Christianity by torture in various inquisitions, yet felt unable to break their vow to follow Christianity. In recognition of this history, the Reform movement restored this prayer to its liturgy.
In any event, saying this prayer does not have any effect on our obligation to do as we have vowed to do, either individually or collectively.
There are many additions to the regular liturgy (there would have to be, to get such a long service). Perhaps the most important addition is the confession of the sins of the community, which is inserted into the shemoneh Esrei (Amidah) prayer. Note that all sins are confessed in the plural (we have done this, we have done that), emphasizing communal responsibility for sins.
There are two basic parts of this confession: Ashamnu, a shorter, more general list (we have been treasonable, we have been aggressive, we have been slanderous . . .), and Al Chet, a longer and more specific list (for the sin we sinned before you forcibly or willingly, and for the sin we sinned before you by acting callously . . .) Frequent petitions for forgiveness are interspersed in these prayers. There's also a catch-all confession: "Forgive us the breach of positive commands and negative commands, whether or not they involved an act, whether or not they are known to us".
It is interesting to note that these confessions do not specifically address the kinds of ritual sins that some people think are the be-all-and-end-all of Judaism. There is no "for the sin we have sinned before you by eating pork, and for the sin we have sinned against you by driving on Shabbat" (though obviously these are implicitly included in the catch-all). The vast majority of the sins enumerated involve mistreatment of other people, most of them by speech (offensive speech, scoffing, slander, talebearing, and swearing falsely, to name a few). These all come into the category of sin known as "lashon ha-ra" (literally, the evil tongue), which is considered a very serious sin in Judaism.
The concluding service of Yom Kippur, known as Ne'ilah, is one unique to the day. It usually runs about 1 hour long. The ark (a cabinet where the scrolls of the Torah are kept) is kept open throughout this service. There is a tone of desperation in the prayers of this service. The service is sometimes referred to as the closing of the gates; think of it as the "last chance" to get in a good word before the holiday ends. The service ends with a very long blast of the shofar. See Rosh Hashanah for more about the shofar and its characteristic blasts.
Yom Kippur occurs on the following days on the civil calendar:
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