John 6:51

Your fathers did eat manna in the wilderness, and are dead.

This is the bread which cometh down from heaven, that a man may eat thereof, and not die.

The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?

Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.