Jesus said, "I am the bread come down from heaven," and he still comes to us today through the Eucharist, in which the bread and wine are transubstantiated into his body and blood. As St. Augustine said, when we worthily partake of this sacrament, the Eucharist does not become part of us, we become part of Christ.
Based on John 6:41–51:
The Jews began to complain about Jesus because he said, ‘I am the bread that came down from heaven.’ They were saying, ‘Is not this Jesus, the son of Joseph, whose father and mother we know? How can he now say, “I have come down from heaven”?’ Jesus answered them, ‘Do not complain among yourselves. No one can come to me unless drawn by the Father who sent me; and I will raise that person up on the last day. It is written in the prophets, “And they shall all be taught by God.” Everyone who has heard and learned from the Father comes to me. Not that anyone has seen the Father except the one who is from God; he has seen the Father. Very truly, I tell you, whoever believes has eternal life. I am the bread of life. Your ancestors ate the manna in the wilderness, and they died. This is the bread that comes down from heaven, so that one may eat of it and not die. I am the living bread that came down from heaven. Whoever eats of this bread will live for ever; and the bread that I will give for the life of the world is my flesh.’
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)