The next day John saw Jesus coming unto him, and said, Behold the Lamb of God, who takes away the sin of the world.
All Commentaries on John 1:29 Go To John 1
Theophilus of Antioch
AD 184
He is called the Lamb of God, because God the Father accepted His death for our salvation, or, in other words, because He delivered Him up to death for our sakes. For just as we say, This is the offering of such aman, meaning the offering made by him; in the same sense Christ is called the Lamb of God Who gave His Son to die for our salvation. And whereas that typical lamb did not take away any man’s sin, this one has taken away the sin of the whole world, rescuing it from the danger it was in from the wrath of God. Behold Him Who takes away the sin of the world: he said not, who will take, but, Who takes away the sin of the world; as if He were always doing this. For He did not then only take it away when He suffered, but from that time to the present, He takes it away; not by being always crucified, for He made one sacrifice for sins, but by ever washing it by means of that sacrifice.
Why does he say the sin of the world, not sins? Because he wished to express sin universally: just as we say commonly, that man was cast out of paradise; meaning the whole human race.
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 comes 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.
Attend,O Arius. He said not, He was created before me, but He was before me. Let the false sect of Paul of Samosata attend. They will see that He did not derive His original existence from Mary; for if He derived the beginning of His being from the Virgin, how could He have been before His precursor? it being evident that the precursor preceded Christ by six months, according to the human birth.