Leviticus 23:8, 12, 36

For seven days present a food offering to the LORD. And on the seventh day hold a sacred assembly and do no regular work.’ ”

On the day you wave the sheaf, you must sacrifice as a burnt offering to the LORD a lamb a year old without defect

For seven days present food offerings to the LORD, and on the eighth day hold a sacred assembly and present a food offering to the LORD. It is the closing special assembly; do no regular work.