Albert Barnes Commentary Leviticus 23:27

"Howbeit on the tenth day of this seventh month is the day of atonement: it shall be a holy convocation unto you, and ye shall afflict your souls; and ye shall offer an offering made by fire unto Jehovah." — Leviticus 23:27 (ASV)

Also—Surely. On the special rites of the day, the tenth of Tisri, that is, from the evening of the ninth day of the month to that of the tenth (Leviticus 23:32), see Leviticus 16.