Many followers of Yahweh may be unaware of a remarkable source that provides evidence for the practice of the 7-day Festival of Passover and Unleavened Bread, which occurs from Abib 14 to 20.
This source comes from an extra-biblical work known as the Book of Yashar, or Sefer Ha-Yashar.
While the current copy of the Book of Yashar should not be considered authoritative like Scriptures, its insights regarding the Passover of the Exodus are nonetheless quite informative and interesting.
Book of Yashar
– 81:5 And the children of Israel TRAVELED FROM EGYPT AND FROM GOSHEN AND FROM RAMESES, AND ENCAMPED IN SUCCOTH ON THE FIFTEENTH DAY of the first month.