John 6:59-63

These things said he in the synagogue, as he taught in Capernaum.

Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?

When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?

What and if ye shall see the Son of man ascend up where he was before?

It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.