Isaiah 7:1-17, Matthew 1:18-25
Matthew 1:20–21 (NKJV)
20 But while he thought about these things, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not be afraid to take to you Mary your wife, for that which is conceived in her is of the Holy Spirit. 21 And she will bring forth a Son, and you shall call His name Jesus, for He will save His people from their sins.”
Matthew 1:23 (NKJV)
23 “Behold, the virgin shall be with child, and bear a Son, and they shall call His name Immanuel,” which is translated, “God with us.”
I The prophecy about the virgin birth in Isaiah 7.
II The reason for the virgin birth.