Leviticus 23:33-36

And the LORD spoke to Moses, saying, “Speak to the people of Israel, saying, On the fifteenth day of this seventh month and for seven days is the Feast of Booths to the LORD. On the first day shall be a holy convocation; you shall not do any ordinary work. For seven days you shall present food offerings to the LORD. On the eighth day you shall hold a holy convocation and present a food offering to the LORD. It is a solemn assembly; you shall not do any ordinary work.