John Chrysostom
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.
(Hom. xvii. [al. xvi.] 2) John having made a declaration, so astonishing to all his hearers, viz. that He, whom he pointed out, did of Himself take away the sins of the world, confirms it by a reference to the Father and the Holy Spirit. For John might be asked, how did you know Him? Wherefore he replies beforehand, by the descent of the Holy Spirit: And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him.