From the Bible:
"And so it was, that, while they were there, the days were accomplished that she should be delivered.
"And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn." (Luke 2:6-7)
From the Book of Mormon:
"And I beheld the city of Nazareth; and in the city of Nazareth I beheld a virgin, and she was exceedingly fair and white.
"And it came to pass that I saw the heavens open; and an angel came down and stood before me; and he said unto me; Nephi, what beholdest thou?
"And I said unto him: A virgin, most beautiful and fair above all other virgins.
"And he said unto me: Knowest thou the condescension of God?
"And I said unto him: I know that he loveth his children; nevertheless I do not know the meaning of all things.
"And he said unto me: Behold, the virgin whom thou seest is the mother of the Son of God, after the manner of the flesh.
"And it came to pass that I beheld that she was carried away in the Spirit; and after she had been carried away in the Spirit for the space of a time the angel spake unto me, saying: Look!
"And I looked and beheld the virgin again, bearing a child in her arms.
"And he angel said unto me: Behold the Lamb of God, yea, even the Son of the Eternal Father!" (From 1 Nephi 13-21)