Leviticus 23:40-44 "And you shall take for yourselves on the first day the fruit of beautiful trees, branches of palm trees, the boughs of leafy trees, and willows of the brook; and you shall rejoice before the LORD your God for seven days. You shall celebrate it in the seventh month. You shall dwell in booths for seven days."
Most people associate Sukkot only with the sukkah. But this holiday is much, much more.
A Christian Guide to the Jewish Festival of Sukkot, or Feast of Tabernacles, will give you a deeper appreciation for this Biblical Holiday.
It explains the ritual of the Four Species - Lulav (date palm), Hadas (Myrtle), Aravah (Willow) and Etrog (Citron), their meaning and relevant Bible verses.