John the Apostle
1 John 4:14ASV·traditional attribution

And we have beheld and bear witness that the Father hath sent the Son to be the Saviour of the world.

William Burkitt Anglican

As if the apostle had said, "Though no man hath seen God at any time, yet the apostles, who preach the doctrine of faith unto you, and press the duty of love upon you, have seen with our bodily eyes the Lord Jesus Christ, and do testify, that God the Father glorified his love, by sending his Son to be the Saviour of a perishing...

Geneva Bible Notes Reformed

And we have seen and do testify that the Father sent the Son [to be] the Saviour of the world. (11) He underlays this charity with another foundation, that is, faith in Jesus, which joins us indeed with him, even as charity witnesses that we are joined with him. Furthermore he testifies of Christ, as who had seen him with his eyes.

John Gill Reformed Baptist

And we have seen, and do testify,.... This seems to be particularly said of the apostles, who had a clear discerning of the love and grace of God, manifested in the mission of Christ into the world; for though no man had seen his nature and his person, yet they had seen his love, and the exceeding riches of his grace, which he had shown...