Catechism of the Catholic Church §126 — excerpt
We can distinguish three stages in the formation of the Gospels: 1. the life and teaching of Jesus. the Church holds firmly that the four Gospels, "whose historicity she unhesitatingly affirms, faithfully hand on what Jesus, the Son of God, while he lived among men,…
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.
Also cites: DV 19