"The Lord Himself will give us a sign: Behold, the virgin will conceive and bear a son, and she will call His name Immanuel."
This prophecy was fulfilled in the birth of Christ, a son was born of a virgin through the divine conception, without having a human father. He called himself Emmanuel, which means "God with us." This son born of a human virgin was the same God with us.
Jesus the Messiah!