John 6:63
King James Version
“It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, are spirit, and are life.”
Context
60Many therefore of his disciples, when they had heard said, This is an hard saying; who can hear it?
61When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?
62and if ye shall see the Son of man ascend up where he was before?
63It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, are spirit, and 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 should betray him.
65And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.
66From that many of his disciples went back, and walked no more with him.