In the first chapter of the New Testament, we see the fulfillment of a prophecy that happened over 700 years ago.
Now there are some prophecies where we don't know if they are fulfilled, or (because of our system of Eschatology) we might have some disagreements about. But this one we know for sure - there is a passage in Isaiah 7, and this is the fulfillment.
Barnes, in his Notes on the Bible, writes,
A virgin shall be with child. Matthew clearly understands this as applying literally to a virgin. (Lu 01:34). It thus implies that the conception of Christ was entirely miraculous, or that the body of the Messiah was created directly by the power of God,...
However you read it, God spoke His word in the Old, and fulfilled it it in the New!
