Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel.
The fulfilment of the prophecy
20 But after he had considered this, an angel of the Lord appeared to him in a dream and said, “Joseph son of David, do not be afraid to take Mary home as your wife, because what is conceived in her is from the Holy Spirit.
21 She will give birth to a son, and you are to give him the name Jesus, because he will save his people from their sins.”
22 All this took place to fulfill what the Lord had said through the prophet:
23 “The virgin will conceive and give birth to a son, and they will call him Immanuel” (which means “God with us”).
There is some controversy surrounding these passages where Jewish and some Christian faiths believe that the virgin in Isaiah 7:14 may not be a virgin, and not only that, but she names her son.
Therefore the Lord himself will give you a sign. Behold, a young woman shall conceive and bear a son, and shall call his name Imman′u-el.
Interestingly, the RSV quotes Isaiah 7:14 in Matthew 1:23 to say
Behold, a virgin shall conceive and bear a son, and his name shall be called Emman′u-el
How does the Protestant faith view these passages? Was Jesus' birth foretold in Isaiah 7:14?