Quoted By:
>But our opinion is in accordance with the Eucharist, and the Eucharist in turn establishes our opinion. For we offer to Him His own, announcing consistently the fellowship and union of the flesh and Spirit. For as the bread, which is produced from the earth, when it receives the invocation of God, is no longer common bread, but the Eucharist, consisting of two realities, earthly and heavenly; so also our bodies, when they receive the Eucharist, are no longer corruptible, having the hope of the resurrection to eternity.
-St Irenaeus
He taught the new sacrifice of the new covenant, of which Malachi, one of the twelve prophets, had signified beforehand: [Mal 1:10-11]. By these words He makes it plain that the former people will cease to make offerings to God; but that in every place sacrifice will be offered to Him, and indeed, a pure one; for His name is glorified among the Gentiles.
-St Irenaeus Against Heresies 4:17:5
>They [the Gnostics] 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
-St Ignatius Letter to Smyrnians 7:1
>Take care, then, to use one Eucharist, so that whatever you do, you do according to God: For there is one flesh of our Lord Jesus Christ, and one cup in the union of His blood; one Alter, as there is one bishop
.St. Ignatius Letter to the Philadelphians 4:1
>We call this food Eucharist; and no one else is permitted to partake of it, except one who believes our teaching to be true and who has been washed in the washing which is for the remission of sins and for regeneration [Baptism], and is thereby living as Christ has enjoined.
-St Justin the Martyr First Apology, 66
