Nehemiah 8:14-15

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: 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.