Bible verses that show the Eucharist to be the true Body, Blood, Soul, and Divinity of Jesus Christ:

"Truly, truly, I say to you, he who believes has eternal life. I am the bread of life. Your fathers ate the manna in the
wilderness, and they died. This is bread which comes down from heaven, that a man may eat of it and not die. I am the living
bread which came down from heaven; if any one eats of this bread, he will live for ever; and the bread which I shall give for
the life of the world is my flesh.’ The Jews then disputed among themselves, saying, ‘How can this man give us his flesh to
eat?’ So Jesus said to them, “Truly truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you
have no life in you; he who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day. For my
flesh is food indeed, and my blood is drink indeed’" (John 6:47-55).
 Although the Jews did not believe they fully
understand the intentions behind the words which Jesus spoke.  

“He who eats my flesh and drinks my blood abides in me, and I in him. As the living Father sent me, and I live because of the
Father, so he who eats me will live because of me. This is the bread which came down from heaven, not such as the fathers
ate and died; he who eats this bread will live for ever."  This he said in the synagogue, as he taught at Caper'na-um. Many of
his disciples, when they heard it, said, "This is a hard saying; who can listen to it?"  But Jesus, knowing in himself that his
disciples murmured at it, said to them, "Do you take offense at this? Then what if you were to see the Son of man ascending
where he was before? It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and
life. But there are some of you that do not believe." For Jesus knew from the first who those were that did not believe, and
who it was that would betray him. (John 6:56-64)  
Even some of His followers did not believe that we could eat His real
flesh & blood.

"For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread,
and when he had given thanks, he broke it, and said, ‘
This is my body which is for you. Do this in remembrance of me.’ In
the same way also the cup, after supper, saying, ‘This cup is the new covenant of my blood. Do this, as often as you drink it,
in remembrance of me.’ For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes" (1
Cor. 11:23-26).

"Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body
and blood of the Lord. Let a man examine himself and so eat of the bread and drink of the cup. For anyone who eats and
drinks without discerning the body eats and drinks judgment upon himself. That is why many of you are weak and ill, and
some have died". (1 Cor. 11:27-30).  
Sounds like pretty harsh words if communion is just a symbol as some believe.  
This verse also backs up the Catholic teachings that we should not receive the Eucharist if we are in a state of mortal
sin or if we do not believe everything which the Church teaches.

(Last supper)
 “And he took bread, and when he had given thanks he broke it and gave it to them, saying, "This is my body
which is given for you. Do this in remembrance of me."( Luke 22:19-20)

“ Then they told what had happened on the road, and how he was known to them in the
breaking of the bread.”  (Luke 24:
35-36)
Breaking of the bread = Holy Communion.  Jesus was known to them in holy communion!

(Last supper)
“And as they were eating, he took bread, and blessed, and broke it, and gave it to them, and said, "Take; this is
my body
." And he took a cup, and when he had given thanks he gave it to them, and they all drank of it. And he said to them,
"
This is my blood of the covenant, which is poured out for many.” (Mark 14:22-24)  Again, nowhere in scripture does
Jesus say that His Body & Blood are merely symbols.

(Last supper)
 “Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said,
"Take, eat;
this is my body."  And he took a cup, and when he had given thanks he gave it to them, saying, "Drink of it, all of
you; for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.” (Matthew 26:26-28)
Real Presence in
the Holy Eucharist
The Bible never states that the Eucharist is merely symbolic as most non-catholics
believe.  The Catholic Church teaches that the Holy Eucharist (under the
appearance of bread & wine) is the real body, blood, soul, and divinity of Jesus
Christ.  This belief is an unchangeable Dogma of the Catholic Church.  How this
divine "process" of transubstantiation occurs is one of the great mysteries of the
Catholic Faith.  It is something that cannot truly be comprehended by the human
mind.  Catholics except this belief through Faith in Jesus Christ.