30. So they said to him, “Then what miraculous sign will you perform, so that we may see it and believe you? What will you do?
31. Our ancestors ate the manna in the wilderness, just as it is written, ‘He gave them bread from heaven to eat.’ ”
32. Then Jesus told them, “I tell you the solemn truth, it is not Moses who has given you the bread from heaven, but my Father is giving you the true bread from heaven.
33. For the bread of God is the one who comes down from heaven and gives life to the world.”
     
34. So they said to him, “Sir, give us this bread all the time!”
35. Jesus said to them, “I am the bread of life. The one who comes to me will never go hungry, and the one who believes in me will never be thirsty.
40. For this is the will of my Father—for everyone who looks on the Son and believes in him to have eternal life, and I will raise him up at the last day.”
     
41. Then the Jews who were hostile to Jesus began complaining about him because he said, “I am the bread that came down from heaven,”
42. and they said, “Isn’t this Jesus the son of Joseph, whose father and mother we know? How can he now say, ‘I have come down from heaven’?”
43. Jesus replied, “Do not complain about me to one another.
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.
    …
47. I tell you the solemn truth, the one who believes has eternal life.
48. I am the bread of life.
49. Your ancestors ate the manna in the wilderness, and they died.
50. This is the bread that has come down from heaven, so that a person may eat from it and not die.
51. I am the living bread that came down from heaven. If anyone eats from this bread he will live forever. The bread that I will give for the life of the world is my flesh.”
     
52. Then the Jews who were hostile to Jesus began to argue with one another, “How can this man give us his flesh to eat?”
53. Jesus said to them, “I tell you the solemn truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in yourselves.
54. The one who eats my flesh and drinks my blood has eternal life, and I will raise him up on the last day.
55. For my flesh is true food, and my blood is true drink.
56. The one who eats my flesh and drinks my blood resides in me, and I in him.
57. Just as the living Father sent me, and I live because of the Father, so the one who consumes me will live because of me.
58. This is the bread that came down from heaven; it is not like the bread your ancestors ate, but then later died. The one who eats this bread will live forever.”
     
59. Jesus said these things while he was teaching in the synagogue in Capernaum.
60. Then many of his disciples, when they heard these things, said, “This is a difficult saying! Who can understand it?”
61. When Jesus was aware that his disciples were complaining about this, he said to them, “Does this cause you to be offended?
62. Then what if you see the Son of Man ascending where he was before?
63. The Spirit is the one who gives life; the flesh is of no help at all! The words that I have spoken to you are spirit and are life.

based on NET Bible