The words used by our Blessed Lord when He instituted the Sacrament of His Body and Blood, and which are incorporated in the Prayer of Consecration as set forth in the Communion Service. These words form the essential part of the Consecration and the rubric directs that they be accompanied by certain manual acts which are prescribed. (See MANUAL ACTS.) To effect a valid Sacrament there must be the unfailing use of our Lord's own words in instituting the Blessed Sacrament, the elements of bread and wine, and a duly appointed Priesthood.