Obviously that accomplished the turning away of those whom the Father had not given Him, save the son of perdition. On the night of His betrayal, all that was clearly communicated to the men His Father had given Him.
I am going to trust that Bible Christians know the references. Later still were eyes opened in the "breaking of the bread."
Oh???
13 Now that same day two of them were going to a village called Emmaus, about seven miles[a] from Jerusalem. 14 They were talking with each other about everything that had happened. 15 As they talked and discussed these things with each other, Jesus himself came up and walked along with them; 16 but they were kept from recognizing him.
17 He asked them, “What are you discussing together as you walk along?”
They stood still, their faces downcast. 18 One of them, named Cleopas, asked him, “Are you the only one visiting Jerusalem who does not know the things that have happened there in these days?”
19 “What things?” he asked.
“About Jesus of Nazareth,” they replied. “He was a prophet, powerful in word and deed before God and all the people. 20 The chief priests and our rulers handed him over to be sentenced to death, and they crucified him; 21 but we had hoped that he was the one who was going to redeem Israel. And what is more, it is the third day since all this took place. 22 In addition, some of our women amazed us. They went to the tomb early this morning 23 but didn’t find his body. They came and told us that they had seen a vision of angels, who said he was alive. 24 Then some of our companions went to the tomb and found it just as the women had said, but they did not see Jesus.”
25 He said to them, “How foolish you are, and how slow to believe all that the prophets have spoken! 26 Did not the Messiah have to suffer these things and then enter his glory?” 27 And beginning with Moses and all the Prophets, he explained to them what was said in all the Scriptures concerning himself.
28 As they approached the village to which they were going, Jesus continued on as if he were going farther. 29 But they urged him strongly, “Stay with us, for it is nearly evening; the day is almost over.” So he went in to stay with them.
30 When he was at the table with them, he took bread, gave thanks, broke it and began to give it to them. 31 Then their eyes were opened and they recognized him, and he disappeared from their sight. 32 They asked each other, “Were not our hearts burning within us while he talked with us on the road and opened the Scriptures to us?”
33 They got up and returned at once to Jerusalem. There they found the Eleven and those with them, assembled together 34 and saying, “It is true! The Lord has risen and has appeared to Simon.” 35 Then the two told what had happened on the way, and how Jesus was recognized by them when he broke the bread.
Yes, what Jesus said in John 6 was to send away those who didn’t believe and so weren’t His. But the rest of what you wrote wasn’t clear. Jesus did not give His disciples from His actual body and blood to eat and drink. That’s the literal meaning, and some religions have done it. What Communion represents is His sacrificial death for our sakes, which are our food and drink, what we need to survive eternally. I don’t believe it was fully literal, one reason being that He did not give them of His actual flesh and blood, but said the bread and wine were those things. Catholics say that was literal, but again I’ve never heard one bring up themselves that metaphor exists. I do believe when Jesus uses metaphor it’s often not meant as mere men would mean it. I do believe Jesus is also the Word, living water, our Rock, the Passover Lamb, the Lion of Judah, Light, the Sword of the Spirit, and the Tree of Life. I don’t believe these are mere metaphors, but describe a reality we don’t and can’t fully understand here, but God has given us the things of this world, as shadows of the eternal, so we can get a basic sense of it. How Jesus is all those things and more, including part of the Trinity, we only partly understand now. And that goes for Holy Communion, as well. He did not give the disciples or anyone to eat from His body, not at the Last Supper, nor after, from His resurrected body, but I do believe we eat from Him in the sense of Him somehow being all those things - the Word, the Passover Lamb, Light, living water, etc.