Leviticus 23:40-43

⁴⁰And ye shall take to you in the first day fruits of the fairest tree, and the branches of palm trees, and the branches of a thick-boughed tree, and sallows of the running stream, and ye shall be glad before your Lord God;

⁴¹and ye shall hallow his solemnity seven days in the year; it shall be a lawful thing everlasting in your generations. In the seventh month ye shall hallow the feast days,

⁴²and ye shall dwell in shadowing places seven days; each man that is of the kin of Israel, shall dwell in tabernacles,

⁴³that your after-comers learn, that I made the sons of Israel to dwell in tabernacles, when I led them out of the land of Egypt; I am your Lord God.