Theophylact of Ohrid
Catena Aurea · Johannesevangelium 1
The next day John seeth Jesus coming to him, and saith, Behold the Lamb of God, which taketh away the sin of the world. This is he of whom I said, After me cometh a man which is preferred before me: for he was before me. And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water.
(in loc.) John having said above to those who came from the Pharisees, that there stood one among them whom they knew not, he here points Him out to the persons thus ignorant: This is He of whom I said, After me cometh a man which is preferred before me. Our Lord is called a man, in reference to His mature age, being thirty years old when He was baptized: or in a spiritual sense, as the Spouse of the Church; in which sense St. Paul speaks, I have espoused you to one husband, that I may present you as a chaste virgin to Christ. (2 Cor. 11:2)