The angel answered her, "The Holy Spirit will come on you, and the power of the Most High will overshadow you. Therefore also the holy one who is born from you will be called the Son of God.
And the power of the Highest shall overshadow thee. By "the power of the Highest" is not meant the Lord Jesus Christ, who is sometimes called the power of God; but rather the Holy Ghost, as before, who is styled the finger of God, and power from on high, Luke 11:20 unless it should be thought that the perfection of divine power common to all the three persons is intended: and so points out the means by which the wondrous thing should be performed, even by the power of God; and which should not only be employed in forming the human nature of Christ, but in protecting the virgin from any suspicion and charge of sin, and defending her innocence and virtue, by moving upon Joseph to take her to wife. In the word, "overshadow", some think there is an allusion to the Spirit of God moving upon the face of the waters, in Genesis 1:2 when, מרחפת, he brooded upon them, as the word may be rendered; and which is the sense of it, according to the Jewish writers y as a hen, or any other bird broods on its eggs to exclude its young: and others have thought the allusion may be to הופת חתנים, z, "the nuptial covering": which was a veil, or canopy, like a tent, supported on four staves, under which the bridegroom and bride were betrothed; or, as Dr. Lightfoot thinks, it is a modest phrase alluding to the conjugal embraces, signified by a man's spreading the skirt of his garment over the woman, which Ruth desired of Boaz, Ruth 3:9 though the Jewish writers say a, that phrase is נישואין