Day-of-atonement definition

On the great day of atonement the high priest appears in a vicarious and representative capacity, and offers on behalf of the whole nation which he was considered to embody in his sacred person.

Breeches were assumed on the Day of Atonement.

The laws of the Day of Atonement belong to the Priestly Code.4 There is no trace of this function before the exile; the earliest reference to any such special time of atonement being the proposal of Ezek.