Catechism of the Catholic Church §1846 — excerpt
The Gospel is the revelation in Jesus Christ of God's mercy to sinners. The angel announced to Joseph: "You shall call his name Jesus, for he will save his people from their sins."
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: Luke 15