What does the Holy Bible say about the incarnation of the Son of God, of the Holy Spirit, from the Virgin Mary?

When the Virgin was astonished by the annunciation of the archangel Gabriel, she asked him: “‘How can this be, since I do not know a man?’ And the angel answered and said to her,

315 St. Cyril of Alexandria, Letter 55:20–22 (FOTC 77:22–24).

316 St. John Chrysostom, Homilies on Ephesians 20 (NPNF I/13:147).

317 St. Hilary of Poitiers, The Trinity 6.31 (FOTC 25:201) amended.

‘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.’” (Luke 1:34– 35).