The Christian Day of Atonement is an English translation of the Jewish holiday Yom Kippur. The Bible calls the day Yom Hakippurim (Hebrew, "Day of the Atonements"). The day is commemorated with a 25-hour fast by Jews, but normally a 24 hour fast by Christians who observe it. While not observed by the mainstream of Christianity, the small Christian groups (mostly those with origins in the old Worldwide Church of God) that do observe it usually refer to it as the Day of Atonement.