Passover - Egyptian Confirmation

Unknown to most followers of Yahweh, there is a remarkable witness that provides evidence for the practice of the 7-day Festival of Passover and Unleavened Bread occurring on Abib 14-20. This witness comes from an extra-biblical work, the Book of Yashar. The present copy of the Book of Yashar is by no means to be assigned the authority of Scriptures. However, what the text says regarding the Passover of the Exodus nevertheless proves quite informative and interesting.