2 But the servants would then have been proved false, and not sent by the Lord, if Christ on His advent, by being found exactly such as He was previously announced, had not fulfilled their words. Wherefore He said, “Think not that I have come to destroy the law or the prophets; I came not to destroy, but to fulfil. For verily I say unto you, Until heaven and earth pass away, one jot or one tittle shall not pass from the law and the prophets till all come to pass.” For by His advent He Himself fulfilled all things, and does still fulfil in the Church the new covenant foretold by the law, onwards to the consummation [of all things]. To this effect also Paul, His apostle, says in the Epistle to the Romans, “But now, without the law, has the righteousness of God been manifested, being witnessed by the law and the prophets; for the just shall live by faith.” But this fact, that the just shall live by faith, had been previously announced by the prophets.
Source: Adversus haereses (New Advent)