Leviticus 23:39-41

39When the people have picked the grain, they can enjoy seven feast days to the Lord. The special days will begin on the 15th day of the seventh month. On the first day and on the eighth day they can rest.

40On the first day, they must take fruit and leaves from the trees. Then for seven days they must praise the Lord.

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.