Catechism of the Catholic Church §2579 — excerpt
David is par excellence the king "after God's own heart," the shepherd who prays for his people and prays in their name. His submission to the will of God, his praise, and his repentance, will be a model for the prayer of the people.
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.