Leviticus 23:39-43 (Sukkot)
But on the fifteenth day of the seventh month, when you gather in the produce of the land, you shall celebrate the festival of the Lord for a seven day period; the first day shall be a rest day, and the eighth day shall be a rest day. And you shall take for yourselves on the first day, the fruit of the hadar tree, date palm fronds, a branch of a braided tree, and willows of the brook, and you shall rejoice before the Lord your God for a seven day period. And you shall celebrate it as a festival to the Lord for seven days in the year. [It is] an eternal statute throughout your generations [that] you celebrate it in the seventh month. For a seven day period you shall live in booths. Every resident among the Israelites shall live in booths, in order that your [ensuing] generations should know that I had the children of Israel live in booths when I took them out of the land of Egypt. I am the Lord, your God.