Trembling and astonished he asked, Lord, what do You desire me to do? The Lord said to him, But arise and go into the city, and you will be told what you must do.
Then the angel said to her, The Holy Spirit will come upon you, and the power of the Most High will overshadow you [like a shining cloud]; and so the holy (pure, sinless) Thing (Offspring) which shall be born of you will be called the Son of God. [Exod. 40:34; Isa. 7:14.]