Chapter 15 — Part I — The Eucharist
Section 327. Q. In what consists the Offertory, as a part of the Liturgy? A. In this: that with mention made of the prophecies and types, and partly also of the events themselves, relating to the birth and suffering of Jesus Christ, a portion is taken from the prosphora for use in the Sacrament, and likewise a portion of wine mixed with water is poured off into the holy chalice, while the celebrator makes commemoration of the whole Church, honors the glorified saints, prays for the living and the departed, especially for the ruling powers, and for those who, of their own faith and zeal, have brought prosphoræ, or oblations.