Leviticus 23:36

³⁶and seven days ye shall offer burnt sacrifices to the Lord, and the eighth day shall be most solemn and most holy; and ye shall offer burnt sacrifice to the Lord, for it is the day of company, and of gathering; ye shall not do any servile work therein. (and for seven days ye shall offer burnt sacrifices to the Lord, and then on the eighth day there shall be another holy gathering; and on it ye shall offer a burnt sacrifice to the Lord, for it is the day of congregation, yea, of gathering together; ye shall not do any daily work on it.)