The tractate that follows deals primarily with the four mitzvot specifically assigned for the festival of Sukkot: (1) to dwell in the Sukkah, (2) the Arba Minim, four species, (3) Aravah, setting up willow branches at the side of the altar, and (4) Nisukh ha-Mayim, the water libation.
(R. Pinhas Kehati:
Elucidated Mishnah Series: Sukkah, Introduction, page 9)
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