John 8:16

“Yes, and even if I were to judge my judgment would be true, for it is not I alone who judge, but I and the Father who sent me” (v. 16).

However, He also points out to them that actually He was in a position to judge, and that if He were to judge, they should be in no doubt that His judgments would be accurate and just. For His relationship with the Father was so close that any judgment He did make would be in association with the Father, and would be one with the Father's. Thus it would be totally reliable. For He and His Father judged as One.

So Jesus, while claiming to have the full ability to judge on His own, puts Himself in parallel with His Father and stresses that any judgment that He makes is equally the result of the Father's judgment. The truth of it could not therefore be doubted, and the fact was evidence of Whom He was. One again He is making clear His co-equality with the Father.