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

For there are three that testify:

John Calvin Reformed @genevareformer

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.

Matthew Henry Presbyterian @wholebiblehenry

The faith of the Christian believer (or the believer in Christ) being thus mighty and victorious, it had need to be well founded, to be furnished with unquestionable celestial evidence concerning the divine mission, authority, and office of the Lord Jesus; and it is so; he brings his credentials along with him, and he brings them in a way by which he came and in the witness that attends him.

Commenting on 1 John 5:6-9

John Gill Reformed Baptist @doctorgill

For there are three that bear record in heaven,.... That is, that Jesus is the Son of God. The genuineness of this text has been called in question by some, because it is wanting in the Syriac version, as it also is in the Arabic and Ethiopic versions; and because the old Latin interpreter has it not; and it is not to be found in...