Leviticus 23
39 Ref But on the fifteenth day of the seventh month, when you have got in all the fruits of the land, you will keep the feast of the Lord for seven days: the first day will be a Sabbath, and the eighth day the same.
40 Ref On the first day, take the fruit of fair trees, branches of palm-trees, and branches of thick trees and trees from the riverside, and be glad before the Lord for seven days.
41 Ref And let this feast be kept before the Lord for seven days in the year: it is a rule for ever from generation to generation; in the seventh month let it be kept.
42 Ref For seven days you will be living in tents; all those who are Israelites by birth are to make tents their living-places:
43 Ref So that future generations may keep in mind how I gave the children of Israel tents as their living-places when I took them out of the land of Egypt: I am the Lord your God.