Leviticus 23:33-36

33Adonai spoke to Moses saying:

34“Speak to Bnei-Yisrael, and say, On the fifteenth day of this seventh month is the Feast of Sukkot, for seven days to Adonai.

35On the first day there is to be a holy convocation—you are to do no laborious work.

36For seven days you are to bring an offering by fire to Adonai. The eighth day will be a holy convocation to you, and you are to bring an offering by fire to Adonai. It is a solemn assembly—you shall do no laborious work.