John 6:53-54, 58

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 yourselves. He who eats My flesh and drinks My blood has eternal life, and I will raise him up on the last day.

This is the bread which came down out of heaven; not as the fathers ate and died; he who eats this bread will live forever.”