Leviticus 23:8, 12, 36

But you shall present an offering by fire to the LORD for seven days; on the seventh day there shall be a holy convocation; you shall not do any laborious work [on that day].’ ”

Now on the day when you wave the sheaf you shall offer a male lamb one year old without blemish as 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 a festive assembly; you shall not do any laborious work [on that day].