Augustine of Hippo
Catena Aurea · Johannesevangelium 1
And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. And I saw, and bare record that this is the Son of God.
(de Agon. Christiano, c. 24. [22.]) We do not attribute to Christ only the possession of a real body, and say that the Holy Spirit assumed a false appearance to men’s eyes: for the Holy Spirit could no more, in consistency with His nature, deceive men, than could the Son of God. The Almighty God, Who made every creature out of nothing, could as easily form a real body of a dove, without the instrumentality of other doves, as He made a real body in the womb of the Virgin, without the seed of the male.