Catena Aurea on Matthew 1:1: Hilary of Poitiers

What God conferred on those, who, by the anointing of oil were consecrated as kings or priests, this the Holy Spirit conferred on the Man Christ; adding moreover a purification. The Holy Spirit cleansed that which taken of the Virgin Mary was exalted into the Body of the Saviour, and this is that anointing of the Body of the Saviour’s flesh whence He was called Christ.

[ed. note: This passage is from a work commonly ascribed to Hilary the Deacon. The Fathers bear out its doctrine; e.g. “Since the flesh is not holy in itself, therefore it was sanctified even in Christ, the Word which dwelt in it, through the Holy Ghost, sanctifying His own Temple, and changing it into the energy of His own Nature. For therefore is Christ’s Body understood to be both holy and hallowing, as being made a Temple of the Word united to it bodily, as Paul says.” Cyril Alex. lib. v. in Joann. p. 992.

In like manner, Gregory of Nazianzus speaks of “The Father of the True and really Anointed (Christ), whom He has anointed with the oil of gladness above His fellows, anointing the manhood with the Godhead, so as to make both one.” Orat. 5. fin]

Because the impious craft of the Jews denied that Jesus was born of the seed of David, he adds, “The son of David, the son of Abraham.”