Chapter 18 — Part II: The Sacraments — The Holy Eucharist
Section 177. Proof From Scripture — This doctrine, handed down by the Catholic Church, concerning the truth of this Sacrifice, she received from the words of our Lord, when, on that last night, committing to His Apostles these same sacred mysteries, He said: Do this for a commemoration of me; for then, as was defined by the holy Council, He ordained them priests, and commanded that they and their successors in the priestly office, should immolate and offer His body.