John 6:53-63

53 Jesus therefore said to them, “Most assuredly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you don't have life in yourselves.  54 He who 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 lives 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, he will also live because of me.  58 This is the bread which came down out of heaven-- not as our fathers ate the manna, and died. He who eats this bread will live forever.”  59 These things he said in the synagogue, as he taught in Capernaum.

60 Therefore many of his disciples, when they heard this, said, "This is a hard saying! Who can listen to it?"

61 But Jesus knowing in himself that his disciples murmured at this, said to them, “Does this cause you to stumble?  62 Then what if you would see the Son of Man ascending to where he was before?  63 It is the spirit who gives life. The flesh profits nothing. The words that I speak to you are spirit, and are life.