Catechism of the Catholic Church §2571 — excerpt
Because Abraham believed in God and walked in his presence and in covenant with him, The patriarch is ready to welcome a mysterious Guest into his tent.
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.