John 6:52-54

The Jews therefore strove one with another, saying, How can this man give us his flesh to eat? Jesus therefore 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 not life in yourselves. He that eateth my flesh and drinketh my blood hath eternal life; and I will raise him up at the last day.