Here is the story concerning the birth of Jesus. His mother Mary was engaged to be married to Joseph, but while she was still a virgin it became known that she was pregnant by the Holy Spirit. Because her fiancé Joseph was an honorable and righteous man, he decided to break their engagement off privately rather than publicly disgracing her.
But after he had decided what he was going to do, an angel appeared to him in a dream saying “Joseph, son of David, don’t be concerned about taking Mary as your wife, because the child within her was conceived by the Holy Spirit. She will give birth to a son and you shall name him Jesus (meaning “Yahweh saves”) because he will free people from their sins.”
All of this fulfilled the prophecy spoken by God through the prophet Isaiah:
“Behold the virgin will become pregnant and gave birth to a son, and he shall be called Emmanuel.” (Which means “God is with us.”)
After Joseph woke up, he did as the angel had told him. He took Mary as his wife, but did not know her intimately until she gave birth. And Joseph named him Jesus.