Leviticus 23:33-36

Again the LORD spoke to Moses, saying, “Say to the children of Israel, ‘On the fifteenth day of this seventh month, and for seven days, is the Feast of Booths (Tabernacles) to the LORD. The first day is a holy convocation (calling together); you shall not do any laborious work [on that day]. For seven days you shall present an offering by fire to the LORD. On the eighth day you shall have a holy convocation and present an offering by fire to the LORD. It is a festive assembly; you shall not do any laborious work [on that day].