Vayikra 23:33-36 Orthodox Jewish Bible (OJB)
33 And Hashem spoke unto Moshe, saying,
34 Speak unto the Bnei Yisroel, saying, The fifteenth day of this seventh month shall be the Chag HaSukkot for shivat yamim unto Hashem.
35 On the Yom HaRishon shall be a mikra kodesh; ye shall do no melekhet avodah (laborious work) therein.
36 Shivat yamim ye shall offer an offering made by eish unto Hashem; on the eighth day shall be a mikra kodesh unto you; and ye shall offer an offering made by eish unto Hashem; it is an atzeret (assembly); and ye shall do no melekhet avodah therein.