Saint Ignatius of Antioch on the Real Presence

Ignatius of Antioch to the Ephesians ch 5 (50-117 ad)
For if I in a short time had such converse with your bishop, which was not after the manner of men but in the Spirit, how much more do I congratulate you who are closely joined with him as the Church is with Jesus Christ and as Jesus Christ is with the Father, that all things may be harmonious in unity.
Let no man deceive himself: if any one be not within the altar, he is deprived of the bread of God. For if the prayer of one or two possesses such power, how much more that of the bishop and the whole Church ! He, therefore, that does not assemble with the Church, has even by this manifested his pride, and condemned himself. For it is written, "God resisteth the proud." Let us be careful, then, not to set ourselves in opposition to the bishop, in order that we may be subject to God.

Ignatius of Antioch to the Trallians ch 7 (50-117 ad)
He that is within the altar is pure, but he that is without is not pure; that is, he who does anything apart from the bishop, and presbytery, and deacons, such a man is not pure in his conscience.

Ignatius of Antioch Epistle to the Romans ch 7 [50-117 AD]

"I have no taste for corruptible food nor for the pleasures of this life. I desire the bread of God, which is the flesh of Jesus Christ, who was of the seed of David; and for drink I desire his blood, which is love incorruptible"

Ignatius of Antioch Epistle to the Philadelphians ch 4 [50-117 AD]
Take ye heed, then, to have but one Eucharist. For there is one flesh of one altar; as there is one bishop, along with the presbytery and deacons, my fellow-servants: that so, whatsoever ye do, ye may do it according to [the will of] God.

Ignatius of Antioch Epistle to the Smyraeans ch 6-8 [50-117 AD]
"Take note of those who hold heterodox opinions on the grace of Jesus Christ which has come to us, and see how contrary their opinions are to the mind of God. . . . 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 that Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes" See that ye all follow the bishop, even as Jesus Christ does the Father, and the presbytery as ye would the apostles; and reverence the deacons, as being the institution of God. Let no man do anything connected with the Church without the bishop. Let that be deemed a proper Eucharist, which is [administered] either by the bishop, or by one to whom he has entrusted it. Wherever the bishop shall appear, there let the multitude [of the people] also be; even as, wherever Jesus Christ is, there is the Catholic Church. It is not lawful without the bishop either to baptize or to celebrate a love-feast; but whatsoever he shall approve of, that is also pleasing to God, so that everything that is done may be secure and valid