From the Roman Missal, as promulgated by the Council of Trent
Defects may arise in respect to the formula, if anything is wanting to complete the actual words of consecration. The words of consecration, which are the formative principle of this sacrament, are as follows:
FOR THIS IS MY BODY and
FOR THIS IS THE CHALICE OF MY BLOOD OF THE NEW AND EVERLASTING COVENANT, THE MYSTERY OF FAITH, WHICH SHALL BE SHED FOR YOU AND FOR MANY UNTO THE REMISSION OF SINS
If any omission or alteration is made in the formula of consecration of the Body and Blood, involving a change of meaning, the consecration is invalid. An addition made without altering the meaning does not invalidate the consecration, but the celebrant commits a mortal sin.
Michael Fighting
"Michael…who standeth for…thy people," — Dan. 12:1-12
