John 6:52-54
6:52 Then the Jews who were hostile to Jesus began to argue with one another, “How can this man give us his flesh to eat?”
6:53 Jesus said to them, “I tell you the solemn truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in yourselves.
6:54 The one who eats my flesh and drinks my blood has eternal life, and I will raise him up on the last day.