Leviticus 23:40-43

⁴⁰And you shall take to you on the first day the fruits of the fairest tree, and branches of palm trees, and boughs of thick trees, and willows of the brook, and you shall rejoice before the Lord your God.

⁴¹And you shall keep the solemnity thereof seven days in the year. It shall be an everlasting ordinance in your generations. In the seventh month shall you celebrate this feast.

⁴²And you shall dwell in bowers seven days: every one that is of the race of Israel, shall dwell in tabernacles:

⁴³That your posterity may know, that I made the children of Israel to dwell in tabernacles, when I brought them out of the land of Egypt. I am the Lord your God.