Catechism of the Catholic Church §949 — excerpt
In the primitive community of Jerusalem, the disciples "devoted themselves to the apostles' teaching and fellowship, to the breaking of the bread and the prayers."
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.