Theophylact of Ohrid — as excerpted in the Catena Aurea on John 1:29-31

“(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)”