Numbers 28:26

On the day of the firstfruits , when you offer a grain offering of new grain to the Lord at your Feast of Weeks , you shall have a holy convocation . You shall not do any ordinary work ,

“‘On the day of firstfruits, when you present to the Lord an offering of new grain during the Festival of Weeks, hold a sacred assembly and do no regular work.

Also in the day of the firstfruits, when ye bring a new meat offering unto the Lord, after your weeks be out , ye shall have an holy convocation; ye shall do no servile work :