Nehemiah 8
13 Ref And on the second day the heads of families of all the people and the priests and the Levites came together to Ezra the scribe, to give attention to the words of the law.
14 Ref And they saw that it was recorded in the law that the Lord had given orders by Moses, that the children of Israel were to have tents for their living-places in the feast of the seventh month:
15 Ref And that they were to give out an order, and make it public in all their towns and in Jerusalem, saying, Go out to the mountain and get olive branches and branches of field olives and of myrtle, and palm branches and branches of thick trees, to make tents, as it says in the book.