18 Now the birth of Jesus Christ was as follows: After His mother Mary was betrothed to Joseph, before they came together, she was found with child of the Holy Spirit. 19 Then Joseph her husband, being a just man, and not wanting to make her a public example, was minded to put her away secretly. 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.”
22 So all this was done that it might be fulfilled which was spoken by the Lord through the prophet, saying: 23 “Behold, the virgin shall be with child, and bear a Son, and they shall call His name Immanuel,”[d] which is translated, “God with us.”
24 Then Joseph, being aroused from sleep, did as the angel of the Lord commanded him and took to him his wife, 25 and did not know her till she had brought forth her firstborn Son.[e]And he called His name JESUS.
Luke 1: 34, 35
34 Then Mary said to the angel, “How can this be, since I do not know a man?” 35 And the angel answered and said to her, “The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God.
Bible quote from the New King James Version.