Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,
All Commentaries on Matthew 1:22 Go To Matthew 1
John Chrysostom
AD 407
Having established Joseph’s faith by all means—by past expectations, by future hopes, by present grace and by the honor given to himself—the angel then rings in the prophet also to give expression in support of all these, proclaiming beforehand the good things that are to occur to the world through the Son: Sins are removed and done away. “For he will save his people from their sins.” Here again the coming event exceeds all human expectation. From what are the people being saved? Not from visible warfare or barbarians but something far greater: from their own sins, a work that had never been possible to anyone before. The Gospel of Matthew, Homily