In it the priest, as the representative of Christ, offers to God the bread and wine, which he changes into the Body and Blood of our Lord at the Consecration, and then completes the sacrifice by consuming the Host and drinking the chalice at the Communion.”
... While admitting that the strongest support for this belief is the testimony of tradition, this authority does muster some scriptures in favor of its position, chief of which are Malachi 1:11 and the words of Jesus: “This is my body,” “this is my blood.” (Matt. 26:26, 28, Dy)