The Decalogue in Sacred Scripture
The word "Decalogue" means literally "ten words." God revealed these "ten words" to his people on the holy mountain. They were written "with the finger of God," unlike the other commandments written by Moses. They are pre-eminently the words of God. They are handed on to us in the books of words," but it is in the New Covenant in Jesus Christ that their full meaning will be revealed.
Source: Catechism of the Catholic Church (Vatican.va)