John the Apostle
1 John 5:7ASV·traditional attribution

And it is the Spirit that beareth witness, because the Spirit is the truth.

John Calvin Reformed

7. There are three than bear record in heaven The whole of this verse has been by some omitted. Jerome thinks that this has happened through design rather than through mistake, and that indeed only on the part of the Latins. But as even the Greek copies do not agree, I dare not assert any thing on the subject.

Geneva Bible Notes Reformed

For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one. (h) See (i) Agree in one.

William Burkitt Anglican

That is, "There are three in heaven which do bear record to this truth here upon earth, namely, that Jesus is the Christ; that is to say, the three persons in the Holy Trinity, The Father, the Word, and the Holy Ghost; the Father bore witness both at Christ's baptism and transfiguration also, when with an audible voice he declared, This is my beloved Son...