John 6:53 in the King James Version
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.
Context
52 The Jews therefore contended with one another, saying, “How can this man give us his flesh to eat?”
53 Jesus therefore said to them, “Most certainly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you don’t have life in yourselves.
54 He who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day.