Mary said to the angel, “How will this be, since I am a virgin and have no intimacy with any man?”
and He will reign over the house of Jacob (Israel) forever, and of His kingdom there shall be no end.” [Is 9:6, 7; Dan 2:44]
Then the angel replied to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you [like a cloud]; for that reason the holy (pure, sinless) Child shall be called the Son of God. [Ex 40:34; Is 7:14]
now get up and go into the city, and you will be told what you must do.”