Catechism of the Catholic Church §1612 — excerpt
The nuptial covenant between God and his people Israel had prepared the way for the new and everlasting covenant in which the Son of God, by becoming incarnate and giving his life, has united to himself in a certain way all mankind saved by him, thus preparing for "the wedding-feast of the Lamb."
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: GS 22