John the Apostle
John 1:34ESV·traditional attribution

And I have seen and have borne witness that this is the Son of God.”

John Calvin Reformed @genevareformer

34. I saw and testified. He means that what he declares is not doubtful; because God was pleased to make him fully and thoroughly acquainted with those things of which he was to be the witness to the world; and it is worthy of notice, that he testified that Christ was the Son of God, because he who gives the Holy Spirit must be the...

Matthew Henry Presbyterian @wholebiblehenry

We have in these verses an account of John's testimony concerning Jesus Christ, which he witnessed to his own disciples that followed him. As soon as ever Christ was baptized he was immediately hurried into the wilderness, to be tempted; and there he was forty days.

Commenting on John 1:29-36

John Gill Reformed Baptist @doctorgill

And I saw,.... The Spirit descending from heaven as a dove, and lighting upon Jesus, and remaining some time on him; this he saw with his bodily eyes: and bore record; at the same time, before all the people that were with him, when he baptized Jesus: that this is the Son of God; the natural, essential, and eternal Son of God; who being sent...