Nehemiah 8:13-15

13On the second day of the month, the heads of all the families, along with the priests and the Levites, gathered around Ezra the teacher to give attention to the words of the Law. 14They found written in the Law, which the LORD had commanded through Moses, that the Israelites were to live in temporary shelters during the festival of the seventh month

15and that they should proclaim this word and spread it throughout their towns and in Jerusalem: “Go out into the hill country and bring back branches from olive and wild olive trees, and from myrtles, palms and shade trees, to make temporary shelters”—as it is written. See Lev. 23:37-40.