I believe there is ample proof in the New Testament as well as the early church whose teaching was passed onto them by the apostles. Even Jesus said "Anyone who does eat my flesh and drink my blood has eternal life, and I shall raise him up on the last day. For my flesh is real food and my blood is real drink" (John 6:54).
Also, Paul appeared to support this view: "For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord’s body" (1 Corinthians 11:23-29).
Through partaking in the Eucharist, if we do not discern his body, we are in danger of eating and drinking in judgement to ourselves.
You are taking all the scriptures out of their context in order to put forward false interpretations:
1 Cor 11:27
"So that whoever shall eat this bread and drink this cup of the Lord unworthily, he will be guilty of the body and blood of the Lord.".
The correct interpretation of the above verse
is Paul's rebuke of that congregation which lead up to his statement, which is:
1 Cor 11:20-22
""When ye come together therefore into one place, this is not to eat the Lord’s supper. For in eating each one takes his own supper first; and one is hungry, and another drunken.
For do you not have houses in which to eat and drink? Or do you despise the church of God, and shame those who do not have? What shall I say to you? Shall I praise you for this? I do not praise you!"
Some of those early Christians in that congregation
had dishonored the sacrament by abusing the Lord's table, using it for gluttony and drunkenness. This is the rebuke that lead up to Paul's statement about drinking of the cup and partaking of the bread unworthily:
1 Cor 11:27 "So that whoever shall eat this bread and drink this cup of the Lord unworthily, he will be guilty of the body and blood of the Lord.".
So in my opinion, those who
abuse this scripture by taking it
out of its context in order to
change its meaning so that it can be used to bully the ignorant (who don't read the scriptures properly)
into joining their abuse of the sacrament through their false doctrine of transubstantiation, are doing the same thing - partaking of wine and the bread
unworthily - twice over - once by claiming falsely that the bread becomes "the actual body of Christ" and the wine His actual blood, and once more by taking 1 Cor 11:27
out of its context and changing its meaning in order to bully others into following them into their heresy.
WHAT DID JESUS MEAN BY "THIS IS MY BODY" AND "THIS IS MY BLOOD"?
I believe that the scriptures
cannot be taken out of their context to support false doctrines. Jesus observed all the Biblical Holy Days known as "The Feasts of the Lord" that the Jews observed. When He said this regarding His flesh and His blood, He was eating the Passover meal with His disciples. The cup He took and blessed is (if I recall correctly) was the third cup, known as the cup of Redemption. The breaking of bread is also part of that meal. When Jesus said, "Take, eat, this is My body", and "This is My Blood of the New Covenant" He was telling them that He was the fulfillment of what the Passover meal was pointing to - the fulfillment of the ceremonial law and the prophets (Jer 31:31-33). In other words, He is the bread of Life whose body was to be broken, and His blood was about to be shed for the forgiveness of sins.
When He said, "Do this in remembrance of Me" (Luke 22:19) He was telling them that though they had always observed the Passover meal in remembrance of their deliverance from bondage in Egypt, yet the Passover meal ultimately pointed prophetically to Him, and now they were to do so in remembrance of Him. It wasn't a new observance He was giving them, it was a new interpretation (or at least an interpretation which had been inherent in the Passover meal all along, but was new to His disciples).
We have to read His statement below which He spoke to the Jews in the context of the above, and in the context of their naturally ignorant response when He told them His flesh (life) was to be sacrificed for them:
John 6:51-53 "I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world."
The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?
Then Jesus said unto them, "Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you."
It's clear by the context of the above and the meaning of the blood of the sacrificed Passover Lamb sprinkled on the doorposts of the people in Egypt causing the angel of death to pass over them, what He was talking about - the Jews and Jesus' disciples knew what the meaning of the Passover Lamb was.
Therefore Jesus was not saying that anyone would literally be eating His flesh:
"It is the spirit that quickeneth;
the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life." (John 6:63).
The Biblical context of what Jesus said is the Jewish culture which revolved around the ceremonial Law, of which the Passover Lamb and Passover meal formed an integral part - it was the first "appointed time" (which is called a mo'ed - "God's appointed time" in the Hebrew, and "Feast of the LORD" in the English Bibles) given by God to the Jews. It had been given for a (prophetic) reason, and it, like the Feasts of Firstfruits, Weeks, Pentecost etc had a prophetic meaning.
Therefore in saying, "This is My body given for you" and "This is My blood", Jesus was telling them that His life which He was about to give on the cross for the world, and His blood which He was about to shed, was the ultimate meaning in the details of the Passover meal that they were sharing with Him. He was saying that His disciples, whenever they eat this bread and drink this wine, are to forever remember (a) The Passover Lamb sprinkled on the doorposts which caused the angel of death to pass over God's elect; and (b) the deliverance of the people from bondage in Egypt (which is a Biblical type of deliverance from sin and death); and (c) the body and blood of Christ, our Passover Lamb, who was sacrificed for us on the cross and who sacrificed His life for us and shed His blood for us on the cross.
Jesus gave His body and shed His blood
once for all (Heb 10:10).