Leviticus 23:40-42

40Now on the first day you shall take for yourselves the foliage of beautiful trees, branches of palm trees, and boughs of thick (leafy) trees, and willows of the brook [and make booths of them]; and you shall rejoice before the Lord your God for seven days.

41You shall celebrate it as a feast to the Lord for seven days in the year. It shall be a permanent statute throughout your generations; you shall celebrate it in the seventh month.

42You shall live in booths (temporary shelters) for seven days; all native-born in Israel shall live in booths,