Luke 22:7-23
7 Then came the day of Unleavened Bread on which the Passover lamb had to be sacrificed. 8 Jesus sent Peter and John, saying, “Go and make preparations for us to eat the Passover.”
9 “Where do you want us to prepare for it?” they asked.
10 He replied, “As you enter the city, a man carrying a jar of water will meet you. Follow him to the house that he enters, 11 and say to the owner of the house, ‘The Teacher asks: Where is the guest room, where I may eat the Passover with my disciples?’ 12 He will show you a large room upstairs, all furnished. Make preparations there.”
13 They left and found things just as Jesus had told them. So they prepared the Passover.
14 When the hour came, Jesus and his apostles reclined at the table. 15 And he said to them, “I have eagerly desired to eat this Passover with you before I suffer. 16 For I tell you, I will not eat it again until it finds fulfillment in the kingdom of God.”
17 After taking the cup, he gave thanks and said, “Take this and divide it among you. 18 For I tell you I will not drink again from 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 given for you; do this in remembrance of me.”
20 In the same way, after the supper he took the cup, saying, “This cup is the new covenant in my blood, which is poured out for you. 21 But the hand of him who is going to betray me is with mine on the table. 22 The Son of Man will go as it has been decreed. But woe to that man who betrays him!” 23 They began to question among themselves which of them it might be who would do this.
1 Corinthians 10:16-17
Giving Thanks in the Blood of Jesus
16 Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ? 17 Because there is one loaf, we, who are many, are one body, for we all share the one loaf.
John 6:25-59
Jesus is the Bread of Life
25 When they found him on the other side of the lake, they asked him, “Rabbi, when did you get here?”
26 Jesus answered, “Very truly I tell you, you are looking for me, not because you saw the signs I performed but because you ate the loaves and had your fill.27 Do not work for food that spoils, but for food that endures to eternal life, which the Son of Man will give you. For on him God the Father has placed his seal of approval.”
28 Then they asked him, “What must we do to do the works God requires?”
29 Jesus answered, “The work of God is this: to believe in the one he has sent.”
30 So they asked him, “What sign then will you give that we may see it and believe you? What will you do? 31 Our ancestors ate the manna in the wilderness; as it is written: ‘He gave them bread from heaven to eat.’”
32 Jesus said to them, “Very truly I tell you, it is not Moses who has given you the bread from heaven, but it is my Father who gives you the true bread from heaven. 33 For the bread of God is the bread that comes down from heaven and gives life to the world.”
34 “Sir,” they said, “always give us this bread.”
35 Then Jesus declared, “I am the bread of life. Whoever comes to me will never go hungry, and whoever believes in me will never be thirsty. 36 But as I told you, you have seen me and still you do not believe. 37 All those the Father gives me will come to me, and whoever comes to me I will never drive away. 38 For I have come down from heaven not to do my will but to do the will of him who sent me. 39 And this is the will of him who sent me, that I shall lose none of all those he has given me, but raise them up at the last day. 40 For my Father’s will is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise them up at the last day.”
41 At this the Jews there began to grumble about him because he said, “I am the bread that came down from heaven.” 42 They said, “Is this not Jesus, the son of Joseph, whose father and mother we know? How can he now say, ‘I came down from heaven’?”
43 “Stop grumbling among yourselves,” Jesus answered. 44 “No one can come to me unless the Father who sent me draws them, and I will raise them up at the last day. 45 It is written in the Prophets: ‘They will all be taught by God.’ Everyone who has heard the Father and learned from him comes to me. 46 No one has seen the Father except the one who is from God; only he has seen the Father. 47 Very truly I tell you, the one who believes has eternal life. 48 I am the bread of life. 49 Your ancestors ate the manna in the wilderness, yet they died. 50 But here is the bread that comes down from heaven, which anyone may eat and not die. 51 I am the living bread that came down from heaven. Whoever eats this bread will live forever. This bread is my flesh, which I will give for the life of the world.”
52 Then the Jews began to argue sharply among themselves, “How can this man give us his flesh to eat?”
53 Jesus said to them, “Very truly I tell 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 them up at the last day.55 For my flesh is real food and my blood is real drink. 56 Whoever eats my flesh and drinks my blood remains in me, and I in them. 57 Just as the living Father sent me and I live because of the Father, so the one who feeds on me will live because of me. 58 This is the bread that came down from heaven. Your ancestors ate manna and died, but whoever feeds on this bread will live forever.” 59 He said this while teaching in the synagogue in Capernaum.
There is this term from various Christian traditions called Real Presence...This Real Presence is that Jesus is to literally to be real in the elements He talked about in His Last Supper...
St. Paul writes that the cup of thanksgiving in the participation in the blood of Christ...And is not the bread that we break a participation in the body of Christ?..Because there is one loaf, we, who are many, are one body, for we all share the one loaf...We being many are one bread, and one body: for we are all partakers of that one bread...
The early Christians believed that Christ’s presence is in the Eucharist....St. Ignatius wrote that the bread is the flesh of Jesus and the cup is His blood...And maybe this comes from Jesus Himself saying, “Very truly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you...Whoever eats My flesh and drinks My blood has eternal life, and I will raise them up at the last day...For My flesh is real food and My blood is real drink...Whoever eats My flesh and drinks My blood remains in Me, and I in them...Just as the Living Father sent Me and I live because of the Father, so the one who feeds on Me will live because of Me...This is the bread that came down from heaven...Your ancestors ate manna and died, but whoever feeds on this bread will live forever.”...