“Matthew 26: [26] And whilst they were at supper, Jesus took bread, and blessed, and broke: and gave to his disciples, and said: Take ye, and eat. This is my body. [27] And taking the chalice, he gave thanks, and gave to them, saying: Drink ye all of this. [28] For this is my blood of the new testament, which shall be shed for many unto remission of sins. [29] And I say to you, I will not drink from henceforth of this fruit of the vine, until that day when I shall drink it with you new in the kingdom of my Father. [30] And a hymn being said, they went out unto mount Olivet.”
“Mark 14: [22] And whilst they were eating, Jesus took bread; and blessing, broke, and gave to them, and said: Take ye. This is my body. [23] And having taken the chalice, giving thanks, he gave it to them. And they all drank of it. [24] And he said to them: This is my blood of the new testament, which shall be shed for many.”
"Luke 22: [15] And he said to them: With desire I have desired to eat this pasch with you, before I suffer. [16] For I say to you, that from this time I will not eat it, till it be fulfilled in the kingdom of God. [17] And having taken the chalice, he gave thanks, and said: Take, and divide it among you: [18] For I say to you, that I will not drink of the fruit of the vine, till the kingdom of God come. [19] And taking bread, he gave thanks, and brake; and gave to them, saying: This is my body, which is given for you. Do this for a commemoration of me. [20] In like manner the chalice also, after he had supped, saying: This is the chalice, the new testament in my blood, which shall be shed for you. "
“St. Paul: 1 Corinthians 10: [14] Wherefore, my dearly beloved, fly from the service of idols. [15] I speak as to wise men: judge ye yourselves what I say. [16] The chalice of benediction, which we bless, is it not the communion of the blood of Christ? And the bread, which we break, is it not the partaking of the body of the Lord? [17] For we, being many, are one bread, one body, all that partake of one bread. [18] Behold Israel according to the flesh: are not they, that eat of the sacrifices, partakers of the altar? [19] What then? Do I say, that what is offered in sacrifice to idols, is any thing? Or, that the idol is any thing? [20] But the things which the heathens sacrifice, they sacrifice to devils, and not to God. And I would not that you should be made partakers with devils.”
Jesus said it, Himself: “John 6: [56] For my flesh is meat indeed: and my blood is drink indeed. [57] He that eateth my flesh, and drinketh my blood, abideth in me, and I in him. [58]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. [59] 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.”
Should there ever be any question or doubt that the Eucharist is the true Body and Blood of Jesus? Or that what the Apostles did then, is also exactly what happens in every Catholic Mass? The Apostles were very much aware that the bread and wine that they blessed and shared at their commemoration of the last supper, was the actual Body and Blood of Jesus. Jesus clearly told them that it was. Why should any of us think otherwise? Would Jesus lie to us? Was He just being melodramatic? No. He was telling us the truth. That’s why some of His disciples left Him, then, because they couldn’t believe it, either. He didn’t try to stop them, or even try to change their understanding of what He said, because He knew they understood Him correctly. Who could believe it? The Apostles most certainly did believe it."[69] And Simon Peter answered him: Lord, to whom shall we go? thou hast the words of eternal life. [70] And we have believed and have known, that thou art the Christ, the Son of God. "