John 6:52-54

52 Then the Jews began to argue among themselves, saying, "How can this man give us his flesh to eat?"

53 Jesus said, "I tell you the truth, you must eat the flesh of the Son of Man and drink his blood. Otherwise, you won't have real life in you.

54 Those who eat my flesh and drink my blood have eternal life, and I will raise them up on the last day.