John 8:16

Jesus was not judging anyone then. That aspect of His ministry lies in the future. However even if He did judge then His judgment would prove right (Gr. alethine, valid) because in that activity also He would be acting under and with the Father (cf. John 5:30). As Jesus represented the Father faithfully by revealing Him, so He will represent the Father’s will faithfully by judging. He did everything and will do everything with divine authority.