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As for the sources: for example, the scholastics who taught that the instruments were the form justified their teaching by saying that it was handed down by the Apostles and that the words in Scripture referring to the laying on of hands meant that the hands was required only for the integrity. Of course, as soon as the question was re-raised in the 16th century, examination showed that the oldest missals did not contain it, and most post-Tridentine theologians maintianed either a partial matter, or total matter theory regarding the laying on of hands.
In the Oriental rites the matter of this Sacrament (for the order of presbyterate) is and always has been simply the bishop’s imposition of hands. Up until Nov. 30, 1947, the matter of this Sacrament (for ordination to the priesthood) in the Latin Rite was twofold; namely, the aforesaid imposition of hands and the “bestowal of the instruments,” that is, the touching by the candidate of a chalice containing wine and a few drops of water, and a paten with host. Both elements of this twofold matter were considered to be essential for validity. On the aforementioned date Pope Pius XII issued the Apostolic Constitution Sacramentum Ordinis, in which the Pontiff determined that thereafter the valid matter for the Latin Rite would consist of only the first imposition of hands by the bishop, and not the bestowal of the instruments also.Inocent III on the other hand, taught for example, in his work on the Mass, that Christ did not consecrate at the Last Supper by the words “This is My Body” and “This is My Blood”.
Pius XII distinctly implied, nevertheless, that not only was the bestowal of the instruments considered necessary for validity previously, but that it was in fact necessary: “by Our Apostolic Authority We do … decide that the bestowal of the instruments at least for the future (‘saltem in posterum’) is not necessary for the validity…,” noting that “this Our Constitution does not have retroactive force.” He also granted the possibility that the Church might even in the future revert to maintaining that the bestowal of the instruments is necessary for validity: “But if, according to the will and prescription of the Church, the same should some day be held necessary for validity also, all would know the Church is able even to change and to abrogate what She has established.”
Note that the Sovereign Pontiff Pius XII had both the power and the right to determine further the matter of Holy Orders, since that Sacrament was instituted by Christ “in genere.” On the contrary, no agency on earth, neither pope nor council nor all the bishops of the world collectively, can alter the substance – i.e., the matter and the form – of the Holy Eucharist, which Christ instituted “in specie.”