Translation of the Holy Gospel According to John
At that time Jesus said to the multitudes of the Jews: My Flesh is meat indeed, and My Blood is drink indeed. He that eateth My Flesh, and drinketh My Blood, abideth in Me, and I in him. As the living Father hath sent Me, and I live by the Father, so he that eateth Me, the same also shall live by Me. This is the bread that came down from Heaven. Not as your fathers did eat manna and are dead. He that eateth this Bread shall live for ever.
A Message From St. Justin Martyr’s First Apology, Ch 66.
And this food is called among us Εὐχαριστία [the Eucharist], of which no one is allowed to partake but the man who believes that the things which we teach are true, and who has been washed with the washing that is for the remission of sins, and unto regeneration, and who is so living as Christ has enjoined. 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 by the Word of God, had both 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. For the apostles, in the memoirs composed by them, which are called Gospels, have thus delivered unto us what was enjoined upon them; that Jesus took bread, and when He had given thanks, said, This do ye in remembrance of Me, this is My body; and that, after the same manner, having taken the cup and given thanks, He said, This is My blood; and gave it to them alone.