Vayikra 23:32-34

Orthodox Jewish Bible

³² It shall be unto you a Shabbos Shabbaton, and ye shall afflict your nefashot; in the ninth day of the month at erev, from erev unto erev, shall ye observe your Shabbos.

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.