John 6:59 (KJV)

Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.

For my flesh is meat indeed, and my blood is drink indeed.

He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.

As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me.

This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.

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.

But 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.