What Is Yom Kippur? The Day of Atonement

Once a year the ordinary machinery of life is switched off. No food, no drink, no work, no leather shoes, no going anywhere. Jews who enter a shul on no other day of the year enter on this one, stay most of the day, and come out at nightfall hungry and, in a way that is hard to explain to anyone who has not done it, lighter. This is Yom Kippur (יוֹם הַכִּפֻּרִים), the Day of Atonement - the most solemn day of the Jewish year, and the one the Mishnah calls one of the two happiest.

When Yom Kippur falls in 2026

Yom Kippur 5787 begins at sundown on Sunday, September 20, 2026, and is observed through nightfall on Monday, September 21 - roughly twenty-five hours. Like every Jewish day it starts in the evening, so the fast begins before the sun sets on the 20th, not at midnight or dawn. It falls on the tenth of Tishrei, nine days after Rosh Hashanah, closing the Ten Days of Repentance that the two holidays bracket. Four days later comes Sukkos. For the rest of the year's dates, see every Jewish holiday date for 2026-2027.

What the Torah says the day is for

The Torah states the purpose of the day in a single sentence, in the middle of its description of the Kohen Gadol's service in the Mishkan:

כִּי־בַיּוֹם הַזֶּה יְכַפֵּר עֲלֵיכֶם לְטַהֵר אֶתְכֶם מִכֹּל חַטֹּאתֵיכֶם

"For on this day He shall atone for you, to purify you from all your sins" (Vayikra 16:30). A few chapters later the day is given its calendar place and its practice: the tenth of the seventh month, a Shabbos of complete rest, on which וְעִנִּיתֶם אֶת־נַפְשֹׁתֵיכֶם - "you shall afflict your souls" (Vayikra 23:27-32).

Notice what the verse does not say. It does not say the day makes you innocent, or that it erases the record. It says letaher - to purify. The image is of something being cleaned rather than something being excused, which is why the day is so heavily occupied with water metaphors and white clothing, and why it ends not in relief but in a kind of clarity.

Why the fast

"Afflicting the soul" is understood by the Mishnah (Yoma 8:1) as five restrictions: no eating or drinking, no washing for pleasure, no anointing with oils or creams, no wearing leather shoes, and no marital relations. The point is not suffering for its own sake. Every one of the five is a way the body is normally attended to, and for one day the attending stops so that something else can be heard.

The fast is not for everyone. Someone who is ill, pregnant, nursing, or elderly may be required by halacha to eat - the preservation of life overrides the fast, and treating that leniency as a failure of piety gets the day exactly backwards. Children below bar and bas mitzvah age do not fast a full day. These are real questions with real answers that depend on the person; ask your Rav well before the day rather than deciding alone at four in the afternoon.

Kol Nidrei and the shape of the day

The evening opens with כׇּל נִדְרֵי - Kol Nidrei, "all vows" - chanted three times before sunset while the Torah scrolls are held out of the ark. Its text is legal and dry: an annulment of vows, in Aramaic, of the kind a court would record. Its melody is anything but. Whole communities are held by it, and many people who cannot follow a word of the Aramaic will tell you it is the moment the year turns.

The day itself carries more prayer than any other in the calendar. Shacharis and the Torah reading; Musaf, which retells the Kohen Gadol's service in the Beis Hamikdash in detail, the one day he entered the Holy of Holies; Mincha, at which the entire book of Yonah is read - a prophet who runs from his assignment and a city that repents anyway; and then נְעִילָה, Neilah, "the closing," a fifth service that exists on no other day of the year. The name refers to gates being shut. The ark is commonly left open through it, and the congregation stands.

At the very end, one long blast: the shofar is sounded once, a tekiah gedolah, and the fast is over. The liturgy of the High Holidays is long and unfamiliar enough that following it without help is genuinely hard, which is what a machzor is for.

Vidui: saying it out loud

Threaded through the services is vidui, confession, said in the plural: ashamnu, bagadnu, gazalnu - "we have been guilty, we have betrayed, we have stolen" - an alphabetical list, followed by the longer עַל חֵטְא, Al Chet, which catalogues sins in pairs through the alphabet again. Nobody in the room has done all of them. That is the design: the confession is communal, so no one has to stand out and no one gets to stand apart.

Underneath it all is teshuvah, the work that began a month earlier in Elul. The Rambam (Hilchos Teshuvah 2:7) writes that Yom Kippur is the time of teshuvah for everyone, individual and community alike - the day does not replace the turning, it is the day the turning is accepted.

The part the day does not cover

There is one limit, and the Mishnah is blunt about it. Yom Kippur atones for offenses between a person and God. For offenses between a person and another person, it atones only once you have made it right with them first (Yoma 85b). No amount of fasting substitutes for the phone call.

This is why the days before Yom Kippur are traditionally spent asking forgiveness of people, not only of God, and why some of the hardest work of the season happens nowhere near a shul. The vertical and the horizontal are not separable here. The day is arranged so that the easier one cannot be used to avoid the harder one.

The happiest day

For all its solemnity, the tradition refuses to file Yom Kippur under sorrow. "There were no better days for Israel than the fifteenth of Av and Yom Kippur," says the Mishnah (Taanis 4:8) - naming the most fearsome day of the year as one of the two best. It is a strange claim until you have sat through a Neilah. Many wear white; some wear a kittel, the same simple white garment a person is buried in. You spend a day dressed for the end of your life and discover, at nightfall, that you have been given the rest of it back.

Then people go home and eat, and four days later they are outside with hammers and bamboo, building a hut. The joy of Sukkos does not arrive instead of the Days of Awe. It arrives on the far side of them.

Bayit keeps the weekly parsha, daily tefilah, and Shabbos and holiday times in one quiet place - and a private place to ask the questions the season raises, with sources quoted.