Catechism of the Catholic Church §1388 — excerpt
It is in keeping with the very meaning of the Eucharist that the faithful, if they have the required dispositions, receive communion each time they participate in the Mass.
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.
Also cites: CIC, can. 917 · AAS 76 (1984) 746-747 · SC 55