Leviticus 23:8, 12, 36

But for seven days you shall present an offering by fire to the LORD. On the seventh day is a holy convocation; you shall not do any laborious work.’ ”

Now on the day when you wave the sheaf, you shall offer a male lamb one year old without defect for a burnt offering to the LORD.

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 an assembly. You shall do no laborious work.