http://www.ccel.org/ccel/schaff/anf09.xvi.ii.iv.xiv.html?
Origen
Origen didn't believe in transubstantiation. He refers to Christians consuming bread in communion, explains that the bread itself
doesn't profit those who consume it, and contrasts that bread with the person of Christ:
"Now, if 'everything that entereth into the mouth goes into the belly and is cast out into the drought,' even the meat
which has been sanctified through the word of God and prayer, in accordance with the fact that it is material,
goes into the belly and is cast out into the draught, but in respect of the prayer which comes upon it, according to the proportion of the faith,
becomes a benefit and is a means of clear vision to the mind which looks to that which is beneficial, and it is not the material of the bread
but the word which is said over it which is of advantage to him who eats it not unworthily of the Lord. And these things indeed are said of the
typical and symbolical body. But many things might be said about the Word Himself who became flesh, and true meat of which he that eateth
shall assuredly live for ever, no worthless person being able to eat it; for if it were possible for one who continues worthless to eat of Him who became flesh,
who was the Word and the living bread, it would not have been written, that 'every one who eats of this bread shall live for ever.'" (On Matthew, 11:14)
ORIGEN (c. 185 - 254 A.D.)
We give thanks to the Creator of all, and, along with thanksgiving and prayer for the blessings we have received, we also eat the bread presented to us; and this bread
BECOMES BY PRAYER A SACRED BODY, which sanctifies those who sincerely partake of it.
(Against Celsus 8:33)
You see how the ALTARS are no longer sprinkled with the blood of oxen, but consecrated BY THE PRECIOUS BLOOD OF CHRIST. (Homilies on Josue 2:1)
You are accustomed to take part in the divine mysteries, so you know how, when you have received
THE BODY OF THE LORD, you reverently exercise every care lest a particle of it fall, and lest anything of the consecrated gift perish....how is it that you think neglecting the word of God a lesser crime than neglecting
HIS BODY?
(Homilies on Exodus 13:3)
...now, however, in full view, there is the true food,
THE FLESH OF THE WORD OF GOD, as He Himself says: "
MY FLESH IS TRULY FOOD, AND MY BLOOD IS TRULY DRINK."
(Homilies on Numbers 7:2)
Protestant scholars Darwell Stone, JND Kelly, on the ante-Nicene Fathers, and how unanimous the Catholic Church was for 1,500 years on the Holy Eucharist. The historical testimony is simply overwhelming.
Darwell Stone's Conclusion of the Ante-Nicene Fathers "...THROUGHOUT the writers of the period the identification of the ELEMENTS WITH THE BODY AND BLOOD OF CHRIST appears to be the ruling idea."
"The belief that the Eucharist IS A SACRIFICE is found EVERYWHERE. This belief is coupled with strong repudiations of carnal sacrifices; and is saved from being Judaic by the recognition of the ELEMENTS AS CHRIST'S BODY AND BLOOD, of the union of the action of the Church on earth with that of Christ in heaven, and of the spiritual character of that whole priestly life and service and action of the community as the body of Christ which is a distinguishing mark of the Christian system." (A History of the Doctrine of the Holy Eucharist, volume 1, page 54, emphasis added)
JND Kelly's Summary of the Ante-Nicene Fathers"....the eucharist was regarded as the distinctively Christian SACRIFICE from the closing decade of the first century, if not earlier. Malachi's prediction (1,10f) that the Lord would reject the Jewish sacrifices and instead would have 'a pure offering' made to Him by the Gentiles in every place was early seized upon by Christians [Did 14,3; Justin dial 41,2f; Irenaeus ad haer 4,17,5] as a prophecy of the eucharist....It was natural for early Christians to think of the eucharist as a sacrifice. The fulfillment of prophecy demanded a solemn Christian offering, and the rite itself was wrapped in the sacrificial atmosphere with which our Lord invested the Last Supper....Ignatius roundly declares [Smyrn 6,2] that 'the eucharist is the flesh of our Savior Jesus Christ, which suffered for our sins and which the Father in His goodness raised'. The bread is the flesh of Jesus, the cup His blood [Rom 7,3]. CLEARLY he intends this realism to be taken STRICTLY, for he makes it the basis of his argument against the Docetists' DENIAL of the REALITY of Christ's body....Justin actually refers to the CHANGE [1 Apol 66,2]....So Irenaeus teaches [Haer 4,17,5; 4,18,4; 5,2,3] that the bread and wine are REALLY the Lord's body and blood. His witness is, indeed, all the more IMPRESSIVE because he produces it quite incidentally while refuting the Gnostic and Docetic REJECTION of the Lord's real humanity. Like Justin, too, he seems to postulate a CHANGE [Haer 4,18,5].....The eucharist was also, of course, the great act of worship of Christians, their SACRIFICE. The writers and liturgies of the period are UNANIMOUS in recognizing it as such." (Early Christian Doctrines, page 196-198, 214 emphasis added)