John the Apostle
John 8:16BSB·traditional attribution

But even if I do judge, My judgment is true, because I am not alone; I am with the Father who sent Me.

John Calvin Reformed @genevareformer

16. And if I judge, He adds this correction, that he may not appear entirely to surrender his right. If I judge, says he, my judgment is true, that is, it is entitled to authority. Now the authority arises from this consideration, that he does nothing but according to the commandment of the Father. For I am not alone.

Matthew Henry Presbyterian @wholebiblehenry

The rest of the chapter is taken up with debates between Christ and contradicting sinners, who cavilled at the most gracious words that proceeded out of his mouth. It is not certain whether these disputes were the same day that the adulteress was discharged; it is probable they were, for the evangelist mentions no other day, and takes notice (Joh 8:2) how early Christ began that day's work.

Commenting on John 8:12-20

John Gill Reformed Baptist @doctorgill

I am one that bear witness of myself,.... As he does of his sonship, in Jo1 5:7. And the Father that sent me, beareth witness of me; as he did, by the descent of the Spirit upon him at his baptism, and by a voice from heaven, both at that time, and at his transfiguration, and by the miracles which he wrought; and particularly he...