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The Didache 14, 1 (C. 90 - 150 AD):
"Assemble on the Lord’s day, and break bread and offer the Eucharist; But first make confession of your faults, so that your sacrifice may be a pure one...For this is the offering of which the Lord has said, ‘Everywhere and always bring me a sacrifice that is undefiled, for I am a great king, says the Lord and my name is the wonder of nations’ (Malachias 1, 11,...)."
St. Clement of Rome, Letter to the Corinthians 44, 4 (C. 98 AD):
"Our sin will not be small if we eject from the episcopate those who blamelessly and holily have offered its Sacrifices. Blessed are those presbyters who have already finished their course, and who have obtained a fruitful and perfect release."
St. Ignatius of Antioch, Letter to the Smyrnaeans 7, 1 (C. 110 AD):
"They abstain from the Eucharist and from prayer, because they do not confess that the Eucharist is the Flesh of our Savior Jesus Christ, Flesh which suffered for our sins and which the Father, in His goodness, raised up again. They who deny the gift of God are perishing in their disputes."
St. Justin Martyr, First Apology 66 (C. 155 AD):
"For not as common bread nor common drink do we receive these; but since Jesus Christ our Savior was made incarnate by the word of God and had both flesh and blood for our salvation, so too, as we have been taught, the food which has been made into the Eucharist by the Eucharistic prayer set down by Him, and by the change of which our blood and flesh is nourished is both the flesh and the blood of that incarnated Jesus...The Apostles, in the Memoirs which they produced, which are called Gospels, have thus passed on that which was enjoined upon them: that Jesus took bread and, having given thanks, said, ‘Do this in remembrance of Me; this is My Body.’ And in like manner, taking the cup, and having given thanks, He said, ‘This is My Blood.’ And He imparted this to them only."
St. Irenaeus of Lyons, Against Heresies 4, 17, 5 (C. 180 AD):
"He took that created thing, bread, and gave thanks and said, This is My Body. And the cup likewise, which is part of that creation to which we belong, He confessed to be His Blood, and taught the new oblation of the new covenant, which the Church, receiving from the Apostles, offers to God throughout the world…concerning which Malachy, among the twelve prophets thus spoke beforehand: From the rising of the sun to the going down, My name is glorified among the gentiles, and in every place incense is offered to My name and a pure sacrifice…indicating in the plainest manner that in every place sacrifice shall be offered to Him, and at that a pure one."
St. Hippolytus of Rome, Commentary on Daniel 22 (220 AD):
"For when the Gospel is preached in every place, the times being then accomplished…the abomination of desolation will be manifested, and when he (the Antichrist) comes, the sacrifice and oblation will be removed, which are now offered up to God in every place by the gentiles."
Origen, Homilies on Numbers Hom. 7, 2 (Post 244 AD):
"Formally, in an obscure way, there was manna for food; 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.’"
St. Cyprian of Carthage, Epistle to Caecilius on the Sacrament of the Cup of the Lord 4 (253 AD):
"In the priest Melchizedek we see prefigured the sacrament of the sacrifice of the Lord, according to what divine Scripture testifies, ‘And Melchizedek, king of Salem, brought forth bread and wine’…For who is more a priest of the most high God than Our Lord Jesus Christ, who offered a sacrifice to God the Father, and offered that very same thing which Melchizedek had offered, that is, bread and wine, to wit, His body and blood?…In Genesis therefore, that the benediction…might be duly celebrated, the figure of Christ's sacrifice precedes as ordained in bread and wine; which thing the Lord, completing and fulfilling, offered bread and the cup mixed with wine, and so He who is the fullness of truth fulfilled the truth of the image prefigured."
St. Cyril of Jerusalem, Catechetical Lectures 23, 15 (C. 350 AD):
"Give us this day our supersubstantial bread. The bread which is of the common sort is not supersubstantial. But the Bread which is holy, that Bread is supersubstantial, as if to say, directed toward the substance of the soul. This Bread does not go into the belly, to be cast out into the privy. Rather, it is distributed through your whole system, for the benefit of body and soul."
St. Athanasius, Sermon to the Newly Baptized [Ref. Unknown] (C. 373 AD):
"Let us approach the celebration of the mysteries. This bread and this wine, so as long as the prayers and supplications have not taken place, remain simply what they are. But after the great prayers and holy supplications have been sent forth, the Word comes down into the bread and wine - and thus is His Body confected."
St. Ambrose of Milan, Commentaries on Twelve of David’s Psalms 38, 25 (Inter C. 381-397 AD):
"We saw the Prince of Priests coming to us, we saw and heard Him offering His blood for us. We follow, inasmuch as we are able, being priests; and we offer the sacrifice on behalf of the people. And even if we are of but little merit, still, in the sacrifice, we are honorable. For even if Christ is not now seen as the one who offers the sacrifice, nevertheless it is He Himself that is offered in sacrifice here on earth when the Body of Christ is offered. Indeed, to offer Himself He is made visible to us, He whose word makes holy the sacrifice that is offered."
St. Augustine of Hippo, Sermon Against the Jews, 9, 13 (Post 425 AD):
"‘From the rising of the sun even to its setting My name is great among the Gentiles, and in every place sacrifice is offered to My name, a clean oblation; for My name is great among the Gentiles, says the Lord Almighty.’ What do you answer to that? Open your eyes at last, then, any time, and see, from the rising of the sun to its setting, the sacrifice of Christians is offered, not in one place only, as was established with you Jews, but everywhere; and not to just any god at all, but to Him who foretold it, the God of Israel…Not in one place, as was prescribed for you in the earthly Jerusalem, but in every place, even in Jerusalem herself. Not according to the order of Aaron, but according to the order of Melchizedek."