Yom Kippur is considered the holiest Day in the Jewish faith.

Yom Kippur—the Day of Atonement—is considered the most important holiday in the Jewish faith. Falling in the month of Tishrei (September or October in the Gregorian calendar), it marks the culmination of the 10 Days of Awe, a period of introspection and repentance that follows Rosh Hashanah, the Jewish New Year

https://www.history.com/topics/holidays/yom-kippur-history

By Pamela Jimenez
Pamela Jimenez Program Director for the Center for Social Justice