Leviticus 23:39-43 "Mark, on the fifteenth day of the seventh month, when you have gathered in the yield of your land, you shall observe the festival of the LORD [to last] seven days: a complete rest on the first day, and a complete rest on the eighth day.

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On the first day you shall take the product of hadar trees, branches of palm trees, boughs of leafy trees, and willows of the brook, and you shall rejoice before the LORD your God seven days.

 

You shall observe it as a festival of the LORD for seven days in the year; you shall observe it in the seventh month as a law for all time, throughout the ages. 

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You shall live in booths seven days; all citizens in Israel shall live in booths,  in order that future generations may know that I made the Israelite people live in booths when I brought them out of the land of Egypt, I the LORD your God."