John Chrysostom

(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.