Catechism of the Catholic Church §2146 — excerpt
, every improper use of the names of God, Jesus Christ, but also of the Virgin Mary and all the saints.
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.