Leviticus 23:40-42

40On the first day you must take for yourselves branches from majestic trees – palm branches, branches of leafy trees, and willows of the brook – and you must rejoice before the Lord your God for seven days.

41You must celebrate it as a pilgrim festival to the Lord for seven days in the year. This is a perpetual statute throughout your generations; you must celebrate it in the seventh month.

42You must live in temporary shelters for seven days; every native citizen in Israel must live in temporary shelters,