When Joseph discovered that Mary was expecting a child prior to their formalizing their marriage, he was advised by some to put her away. However God sent him a messenger 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. And she will bring forth a Son, and you shall call His name Jesus, for He will save His people from their sins." Joseph listened to the angel, obeyed the will of God and a Savior was born. It wasn't his child, it was the Son of God.
