Catechism of the Catholic Church §631 — excerpt
Jesus "descended into the lower parts of the earth. He who descended is he who also ascended far above all the heavens." The Apostles' Creed confesses in the same article Christ's descent into hell and his Resurrection from the dead on the third day, because…
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: Roman Missal, Easter Vigil 18, Exsultet