John 6:63

60 many, therefore, of his disciples having heard, said, `This word is hard; who is able to hear it?`

61 And Jesus having known in himself that his disciples are murmuring about this, said to them, `Doth this stumble you?

62 if then ye may behold the Son of Man going up where he was before?

63 the spirit it is that is giving life; the flesh doth not profit anything; the sayings that I speak to you are spirit, and they are life;

64 but there are certain of you who do not believe;` for Jesus had known from the beginning who they are who are not believing, and who is he who will deliver him up,

65 and he said, `Because of this I have said to you -- No one is able to come unto me, if it may not have been given him from my Father.`

66 From this [time] many of his disciples went away backward, and were no more walking with him,