John 6:60-66

60Many therefore of his disciples, when they had heardthis, said, This is an hard saying; who can hear it? 61When Jesus knew in himself that his disciples murmured at it, he said to them, Doth this offend you?1 62What if ye shall see the Son of man ascend up where he was before? 63It is the spirit that giveth life; the flesh profiteth nothing: the words that I speak to you, they are spirit, and they are life. 64But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who he was that would betray him. 65And he said, Therefore I said to you, that no man can come to me, except it were given to him by my Father. 66From that time many of his disciples went back, and walked no more with him.