Beda Venerabilis
The straightforward interpretation in this text is evident: the Feast of Tabernacles was traditionally observed for a duration of seven days, commencing from the fifteenth day of the seventh month and concluding on the twenty-first. Following this period, an additional gathering took place on the eighth day, which is the twenty-second day of the month, marked by a special solemnity. As it is expressed in Leviticus, "And on the fifteenth day of the seventh month, when ye gather the produce of the land, ye shall celebrate the feast of the Lord seven days; on the first day ye shall rest, and on the eighth day ye shall rest; on the first day ye shall take unto yourselves branches of beautiful trees" (Leviticus 23:39-40).
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Accordingly, during the seven days of the Feast of Tabernacles, Ezra read from the book of God’s law to the people, evidently indicating that for us, the genuine nourishment for our minds is to dedicate time daily to engage in good deeds by which the Lord enlightens us, listening to, reading, and obeying His words with all our hearts. This celebration begins 'on the fifteenth day of the month in the evening, when the moon is full,' when the fog of our thoughts is cleared by the brilliant light of Christ; it is succeeded by the eighth day, the Sabbath, which signifies rest. This implies that at the moment of our resurrection in the life to come—a hope we cherish in our present existence—we shall rejoice when the long-awaited assembly of all the saints, angels, and humanity stands before their Creator, never to be separated again.