P166 – Resting on the First Day of Sukkot

The LORD spoke to Moses, saying: Say to the Israelite people:
On the fifteenth day of this seventh month there shall be the Feast of Booths to the LORD, [to last] seven days. The first day shall be a sacred occasion: you shall not work at your occupations; seven days you shall bring offerings by fire to the LORD. On the eighth day you shall observe a sacred occasion and bring an offering by fire to the LORD; it is a solemn gathering: you shall not work at your occupations.

Leviticus 23:33-36