John 6: 35, 53, 55 - 56
35 Jesus said to them, "I am the bread of life; he who comes to me shall not hunger, and he who believes in me shall never thirst.
53 So Jesus said to them, "Truly, truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you;
55 For my flesh is food indeed, and my blood is drink indeed.
56 He who eats my flesh and drinks my blood abides in me, and I in him.

EWTN