Catechism of the Catholic Church §2060 — excerpt
The gift of the commandments and of the Law is part of the covenant God sealed with his own. In Exodus, the revelation of the "ten words" is granted between the proposal of the covenant and its conclusion - after the people had committed themselves…
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.
Whole chapters cited: Exodus 19