Vayikra (Lev) 23:33-40

ADONAI said to Moshe, “Tell the people of Isra’el, ‘On the fifteenth day of this seventh month is the feast of Sukkot for seven days to ADONAI. On the first day there is to be a holy convocation; do not do any kind of ordinary work. For seven days you are to bring an offering made by fire to ADONAI; on the eighth day you are to have a holy convocation and bring an offering made by fire to ADONAI ; it is a day of public assembly; do not do any kind of ordinary work. “‘These are the designated times of ADONAI that you are to proclaim as holy convocations and bring an offering made by fire to ADONAI — a burnt offering, a grain offering, a sacrifice and drink offerings, each on its own day — besides the Shabbats of ADONAI, your gifts, all your vows and all your voluntary offerings that you give to ADONAI. “‘But on the fifteenth day of the seventh month, when you have gathered the produce of the land, you are to observe the festival of ADONAI seven days; the first day is to be a complete rest and the eighth day is to be a complete rest. On the first day you are to take choice fruit, palm fronds, thick branches and river-willows, and celebrate in the presence of ADONAI your God for seven days.