The Orthodox Church believes the Eucharist to be a sacrifice. As is heard in the Liturgy, “Thine of Thine own we offer to Thee, in all and for all.”
At the Eucharist, the sacrifice offered is Christ himself, and it is Christ himself who in the Church performs the act of offering: He is both priest and victim.
We offer to Thee. The Eucharist is offered to God the Trinity — not just to the Father but also to the Holy Spirit and to Christ Himself. So, what is the sacrifice of the Eucharist? By whom is it offered? and to whom is it offered? In each case the answer is Christ.
We offer for all: according to Orthodox theology, the Eucharist is a propitiatory sacrifice, offered on behalf of both the living and the dead.
The Church teaches that the sacrifice is not a mere figure or symbol but a true sacrifice. It is not the bread that is sacrificed, but the very Body of Christ. And, the Lamb of God was sacrificed only once, for all time. The sacrifice at the Eucharist consists, not in the real and bloody immolation of the Lamb, but in the transformation of the bread into the sacrificed Lamb.
All the events of Christ’s sacrifice, the Incarnation, the Last Supper, the Crucifixion, the Resurrection, and the Ascension are not repeated in the Eucharist, but they are made present.