John the Apostle
John 5:32BSB·traditional attribution

There is another who testifies about Me, and I know that His testimony about Me is valid.

Matthew Henry Presbyterian @wholebiblehenry

In these verses our Lord Jesus proves and confirms the commission he had produced, and makes it out that he was sent of God to be the Messiah. I. He sets aside his own testimony of himself (Joh 5:31): "If I bear witness of myself, though it is infallibly true (Joh 8:14), yet, according to the common rule of judgment among men, you will not...

Commenting on John 5:31-47

John Gill Reformed Baptist @doctorgill

There is another that beareth witness of me,.... Meaning not his Father, who is another, and a distinct person, from him, as the Spirit is another comforter; and both distinct testifiers from him, as well as of him. This is indeed the sense of some interpreters; but the Father is particularly mentioned in Joh 5:37; and the thread of the discourse, and the climax, or...

Albert Barnes Presbyterian @notesbybarnes

Verse 32. There is another. That is, God. See . (e) "another"