Leviticus 23:34, 40

“Give the following instructions to the people of Israel. Begin celebrating the Festival of Shelters on the fifteenth day of the appointed month—five days after the Day of Atonement. This festival to the LORD will last for seven days.

On the first day gather branches from magnificent trees—palm fronds, boughs from leafy trees, and willows that grow by the streams. Then celebrate with joy before the LORD your God for seven days.