The following are the main passages from the New Testament establishing the truth of the Holy Eucharist. Omitted here are Old Testament prefigurations like Melchizedek, the priest of God Most High, who offered bread and wine, and the texts concerning the manna, which is called “bread from heaven.” It is clear from the words of Jesus and St Paul that the Catholic teaching on the Holy Eucharist is the biblical teaching. We accept that Our Lord and the Apostle Paul meant precisely what they said. [Translation is the New King James version.]
26 And as they were eating, Jesus took bread, blessed and broke it, and gave it to the disciples and said, “Take, eat; this is My body.” 27 Then He took the cup, and gave thanks, and gave it to them, saying, “Drink from it, all of you. 28 For this is My blood of the new covenant, which is shed for many for the remission of sins.
22 And as they were eating, Jesus took bread, blessed and broke it, and gave it to them and said, “Take, eat; this is My body.” 23 Then He took the cup, and when He had given thanks He gave it to them, and they all drank from it. 24 And He said to them, “This is My blood of the new covenant, which is shed for many.
14 When the hour had come, He sat down, and the twelve apostles with Him. 15 Then He said to them, “With fervent desire I have desired to eat this Passover with you before I suffer; 16 for I say to you, I will no longer eat of it until it is fulfilled in the kingdom of God.”
17 Then He took the cup, and gave thanks, and said, “Take this and divide it among yourselves; 18 for I say to you, I will not drink of the fruit of the vine until the kingdom of God comes.” 19 And He took bread, gave thanks and broke it, and gave it to them, saying, “This is My body which is given for you; do this in remembrance of Me.” 20 Likewise He also took the cup after supper, saying, “This cup is the new covenant in My blood, which is shed for you.
30 Now it came to pass, as He sat at the table with them, that He took bread, blessed and broke it, and gave it to them. 31 Then their eyes were opened and they knew Him; and He vanished from their sight. 32 And they said to one another, “Did not our heart burn within us while He talked with us on the road, and while He opened the Scriptures to us?” 33 So they rose up that very hour and returned to Jerusalem, and found the eleven and those who were with them gathered together, 34 saying, “The Lord is risen indeed, and has appeared to Simon!” 35 And they told about the things that had happened on the road, and how He was known to them in the breaking of bread.
[I include the above text here because it expresses the faith of the early Church. After Christ “vanished from their sight” through his ascension into Heaven, He was always with them, according to his promise (Mt. 28:20), especially by making Himself known through the breaking of the Bread from Heaven, the Holy Eucharist.]
30 Therefore they said to Him, “What sign will You perform then, that we may see it and believe You? What work will You do? 31 Our fathers ate the manna in the desert; as it is written, ‘He gave them bread from heaven to eat.’” 32 Then Jesus said to them, “Most assuredly, I say to you, Moses did not give you the bread from heaven, but My Father gives you the true bread from heaven. 33 For the bread of God is He who comes down from heaven and gives life to the world.”
34 Then they said to Him, “Lord, give us this bread always.” 35 And Jesus said to them, “I am the bread of life. He who comes to Me shall never hunger, and he who believes in Me shall never thirst. 36 But I said to you that you have seen Me and yet do not believe. 37 All that the Father gives Me will come to Me, and the one who comes to Me I will by no means cast out. 38 For I have come down from heaven, not to do My own will, but the will of Him who sent Me. 39 This is the will of the Father who sent Me, that of all He has given Me I should lose nothing, but should raise it up at the last day. 40 And this is the will of Him who sent Me, that everyone who sees the Son and believes in Him may have everlasting life; and I will raise him up at the last day.”
41 The Jews then complained about Him, because He said, “I am the bread which came down from heaven.” 42 And they said, “Is not this Jesus, the son of Joseph, whose father and mother we know? How is it then that He says, ‘I have come down from heaven’?” 43 Jesus therefore answered and said to them, “Do not murmur among yourselves. 44 No one can come to Me unless the Father who sent Me draws him; and I will raise him up at the last day. 45 It is written in the prophets, ‘And they shall all be taught by God.’ Therefore everyone who has heard and learned from the Father comes to Me. 46 Not that anyone has seen the Father, except He who is from God; He has seen the Father. 47 Most assuredly, I say to you, he who believes in Me has everlasting life. 48 I am the bread of life. 49 Your fathers ate the manna in the wilderness, and are dead. 50 This is the bread which comes down from heaven, that one may eat of it and not die. 51 I am the living bread which came down from heaven. If anyone eats of this bread, he will live forever; and the bread that I shall give is My flesh, which I shall give for the life of the world.” 52 The Jews therefore quarreled among themselves, saying, “How can this Man give us His flesh to eat?”
53 Then Jesus said to them, “Most assuredly, I say to you, unless you eat the flesh of the Son of Man and drink His blood, you have no life in you. 54 Whoever eats My flesh and drinks My blood has eternal life, and I will raise him up at the last day. 55 For My flesh is food indeed, and My blood is drink indeed. 56 He who eats My flesh and drinks My blood abides in Me, and I in him. 57 As the living Father sent Me, and I live because of the Father, so he who feeds on Me will live because of Me. 58 This is the bread which came down from heaven—not as your fathers ate the manna, and are dead. He who eats this bread will live forever… 64 But there are some of you who do not believe.”
1 Corinthians 10
15 I speak as to wise men; judge for yourselves what I say. 16 The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
1 Corinthians 11
23 For I received from the Lord that which I also delivered to you: that the Lord Jesus on the same night in which He was betrayed took bread; 24 and when He had given thanks, He broke it and said, “Take, eat; this is My body which is broken for you; do this in remembrance of Me.” 25 In the same manner He also took the cup after supper, saying, “This cup is the new covenant in My blood. This do, as often as you drink it, in remembrance of Me.”
26 For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes. 27 Therefore whoever eats this bread or drinks this cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord. 28 But let a man examine himself, and so let him eat of the bread and drink of the cup. 29 For he who eats and drinks in an unworthy manner eats and drinks judgment to himself, not discerning the Lord’s body. 30 For this reason many are weak and sick among you, and many sleep [i.e., have died].
10 We have an altar from which those who serve the tabernacle have no right to eat.
[This is perhaps a bit obscure at first glance. “Those who serve the tabernacle” are the Jews, who ate the animal sacrifices offered to God on the altar in the temple. “We” are the Christians, for whom the sacrificial Victim is Christ. But the fact that we eat something that those who do not believe in Christ are forbidden to eat, and the fact that it is an altar from which we eat (implying a sacrifice; not just a table with bread and grape juice), can mean only that the sacrifice of Christ is made present to Christians in the Holy Eucharist, and we eat the sacrificed Body and Blood of Jesus Christ, sacramentally present on all the altars of the Church.]
The Bible thus tells us that the Holy Eucharist is the Body and Blood of Our Lord Jesus Christ, Bread from Heaven, real food, real drink, by which we abide in Him and He in us, and therefore by which we have eternal life and will be raised up on the Last Day.