Lev 23:40-43

40 On the first day you shall take the fruit of majestic[a] trees, branches of palm trees, boughs of leafy trees, and willows of the brook; and you shall rejoice before the Lord your God for seven days. 41 You shall keep it as a festival to the Lord seven days in the year; you shall keep it in the seventh month as a statute forever throughout your generations. 42 You shall live in booths for seven days; all that are citizens in Israel shall live in booths, 43 so that your generations may know that I made the people of Israel live in booths when I brought them out of the land of Egypt: I am the Lord your God.