Leviticus 23:41-43

41They must do this to worship the Lord for seven days of each year. They must obey this rule in the seventh month now, and for all the years to come.

42All Israel's people must live in huts for seven days.

43Your descendants in the future will know that God brought Israel's people out of Egypt. They will know that he caused them to live in huts as they travelled through the wilderness. I am the Lord, your God.’