Easton's Bible Dictionary
Atonement, Day of
It was kept on the tenth day of the month Tisri, i.e., five days before the feast of Tabernacles, and lasted from sunset to sunset. (See AZAZEL .)
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Atonement, Day of'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/a/atonement-day-of.html. 1897.