St Ignatius of Antioch (110AD) wrote:
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 the Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes.
— Letter to the Smyrnaeans, Ch 6
And from the Irish manuscript called the Leabhar Breac, the “Speckled Book”:
The body which was born of the Virgin Mary, without any stain, without destruction of her virginity, without opening of the womb, without presence of man, and which was crucified by the unbelieving Jews out of spite and envy, and which arose after three days from death, and sits on the right hand of God the Father in heaven, in glory and in dignity before the angels of heaven. It is the body the same as it is in this great glory, which the righteous consume off God’s table, that is, off the holy altar. For this body is the rich medicine of the faithful, who journey through the paths of pilgrimage and repentance of this world to the heavenly homeland. This is the seed of the resurrection in the life eternal to the righteous.