"They abstain from the Eucharist and from prayer, because they confess not the Eucharist to be the flesh of our Saviour Jesus Christ, which suffered for our sins, and which the Father, of His goodness, raised up again."
Ignatius of Antioch, Epistle to Smyrnaeans, 7,1 (c. A.D. 110).
"For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Saviour, having been made flesh and blood for our salvation, so likewise have we been taught that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh."
Justin Martyr, First Apology, 66 (c. A.D. 110-165).
"[T]he bread over which thanks have been given is the body of their Lord, and the cup His blood..."
Irenaeus, Against Heresies, IV:18,4 (c. A.D. 200).
"He acknowledged the cup (which is a part of the creation) as his own blood, from which he bedews our blood; and the bread (also a part of creation) he affirmed to be his own body, from which he gives increase to our bodies."
Irenaeus, Against Heresies, V:2,2 (c. A.D. 200).
"But what consistency is there in those who hold that the bread over which thanks have been given is the Body of their Lord, and the cup His Blood, if they do not acknowledge that He is the Son of the Creator of the world..."
Irenaeus, Against Heresies, IV:18, 2 (c. A.D. 200).