He had said that a proclamation should be made throughout their towns and in Jerusalem, telling the people to go to the hills to get branches from olive, wild olive, myrtle, palm, and other leafy trees. They were to use these branches to make shelters in which they would live during the festival, as prescribed in the Law.
5
The mount - The “Mount of Olives” is probably intended.
Pine branches - Rather, “branches of the wild olive.” The actual trees …

The Feast of Tabernacles.

And that they should publish and proclaim in all their cities,
and in Jerusalem
That …

They found it written in the Law about the Feast of Tabernacles. Those who diligently search the Scriptures find things written there that they hav…
Albert Barnes
AlbertBarnes