Leviticus 23:39-43

³⁹"On the fifteenth day of the seventh month, when you have gathered in the produce of the land, you shall keep the feast of the LORD seven days; on the first day shall be a solemn rest, and on the eighth day shall be a solemn rest. ⁴⁰And you shall take on the first day the fruit of goodly trees, branches of palm trees, and boughs of leafy trees, and willows of the brook; and you shall rejoice before the LORD your God seven days. ⁴¹You shall keep it as a feast to the LORD seven days in the year; it is a statute for ever throughout your generations; you shall keep it in the seventh month. ⁴²You shall dwell in booths for seven days; all that are native in Israel shall dwell in booths, ⁴³that your generations may know that I made the people of Israel dwell in booths when I brought them out of the land of Egypt: I am the LORD your God."