Atonement, Day of @ the great annual day of humiliation and expiation for the sins of the nation, "the fast" Acts:27:9), and the only one commanded in the law of Moses. The mode of its observance is described in Leviticus:16:3-10Leviticus:23:26-32; and Numbers:29:7-11. 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.)