Catechism of the Catholic Church §1517 — excerpt
Like all the sacraments the Anointing of the Sick is a liturgical and communal celebration, whether it takes place in the family home, a hospital or church, for a single sick person or a whole group of sick persons.
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: SC 27
