Note 17 at Joh 5:31: This is a reference back to the law of De 17:6 where it took the testimony of two or three witnesses to establish anything legally. Any testimony Jesus gave of Himself would, of course, be the truth (Joh 8:14), but He was simply saying that to be accepted by others as being accurate, He needed the testimony of someone else to bear witness to who He was. Then, He proceeded to use John's witness (Joh 5:32) and the miracles that He had done (Joh 5:36) as well as the Father's testimony (Joh 5:37).