Dr. Edersheims comment on Pesach in the Temple day (before 68 A.D.) [Quote]
The cycle of Temple-festivals appropriately opens with the Passover and Feast of unleavened bread, For, properly speaking, these two are quite distinct, the Passover taking place on the 14th of Nisan, and the Feast of unleavened bread commencing on the 15th, and lasting for seven days to the 21st of the month. But from their close connection they are generally treated as one, both in the Old and New Testament ; and Josephus, on one occasion, even describes it as a feast for eight days.
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The Temple, Its Ministry and Services as they were At The Time Of Jesus Christ. (1874)
Chapter XI The Passover’ Rev. Dr. Alfred Edersheim