Yom Kippur is Judaism’s most sacred day of the year; it is sometimes referred to as the “Sabbath of Sabbaths.” For this reason, even Jews who do not observe other traditions refrain from work, which is forbidden during the holiday, and participate in religious services on Yom Kippur, causing synagogue attendance to soar. Some congregations rent out additional space to accommodate large numbers of worshippers.

The Torah commands all Jewish adults (apart from the sick, the elderly and women who have just given birth) to abstain from eating and drinking between sundown on the evening before Yom Kippur and nightfall the next day. The fast is believed to cleanse the body and spirit, not to serve as a punishment. Religious Jews heed additional restrictions on bathing, washing, using cosmetics, wearing leather shoes and sexual relations. These prohibitions are intended to prevent worshippers from focusing on material possessions and superficial comforts.

​Because the High Holy Day prayer services include special liturgical texts, songs and customs, rabbis and their congregations read from a special prayer book known as the machzor during both Yom Kippur and Rosh Hashanah. Five distinct prayer services take place on Yom Kippur, the first on the eve of the holiday and the last before sunset on the following day. One of the most important prayers specific to Yom Kippur describes the atonement ritual performed by high priests during ancient times. The blowing of the shofar—a trumpet made from a ram’s horn—is an essential and emblematic part of both High Holy Days. On Yom Kippur, a single long blast is sounded at the end of the final service to mark the conclusion of the fast.

​​​​​​​TRADITIONS AND SYMBOLS OF YOM KIPPUR

Pre-Yom Kippur feast: On the eve of Yom Kippur, families and friends gather for a bountiful feast that must be finished before sunset. The idea is to gather strength for 25 hours of fasting.

Breaking of the fast: After the final Yom Kippur service, many people return home for a festive meal. It traditionally consists of breakfast-like comfort foods such as blintzes, noodle pudding and baked goods.

Wearing white: It is customary for religious Jews to dress in white—a symbol of purity—on Yom Kippur. Some married men wear kittels, which are white burial shrouds, to signify repentance.