Matthew now adds an explanatory note to show the fulfillment of the Old Testament types and prophecies in the person and work of Christ:
Related Commentaries of Matthew 1:22
Matthew 1:22-23
22 Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,
23 Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.