Catechism of the Catholic Church §1244 — excerpt
First Holy Communion. Having become a child of God clothed with the wedding garment, the neophyte is admitted "to the marriage supper of the Lamb" and receives the food of the new life, the body and blood of Christ.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Whole chapters cited: Mark 10