Catechism of the Catholic Church §1980 — excerpt
The Old Law is the first stage of revealed law. Its moral prescriptions are summed up in the Ten Commandments.
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.