Catechism of the Catholic Church §578 — excerpt
Jesus, Israel's Messiah and therefore the greatest in the kingdom of heaven, was to fulfil the Law by keeping it in its all embracing detail - according to his own words, down to "the least of these commandments".
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.