Luke narrates the angel Gabriel's announcement to Mary
that she is to conceive a son and remain a virgin.

Luke 1: 26-38
...(The angel Gabriel said) "Hail,
favored one! The Lord is with you ...
The holy Spirit will come upon you, and
the power of the Most High will
overshadow you. Therefore the child
to be born will be called holy, the Son
of God." ... Mary said, "Behold, I am
the handmaid of the Lord. May it be
done to me according to your word."