There was a man sent from God, whose name was John.
All Commentaries on John 1:6 Go To John 1
John Chrysostom
AD 407
1. Having in the introduction spoken to us things of urgent importance concerning God the Word, (the Evangelist) proceeding on his road, and in order, afterwards comes to the herald of the Word, his namesake John. And now that you hear that he was sent from God, do not for the future imagine that any of the words spoken by him are mere man's words; for all that he utters is not his own, but is of Him who sent him. Wherefore he is called messenger Malachi 3:1, for the excellence of a messenger is, that he say nothing of his own. But the expression was, in this place is not significative of his coming into existence, but refers to his office of messenger; for 'there was' a man sent from God, is used instead of a man 'was sent' from God.
How then do some say, that the expression, being in the form of God Philippians 2:6 is not used of His invariable likeness to the Father, because no article is added? For observe, that the article is nowhere added here. Are these words then not spoken of the Father? What then shall we say to the prophet who says, that, Behold, I send My messenger before Your face, who shall prepare Your way Malachi 3:1, as found in Mark 1:2? For the expressions My and Your declare two Persons.