The Pharisees therefore said unto him, You bear record of yourself; your record is not true.
All Commentaries on John 8:13 Go To John 8
Alcuin of York
AD 804
As if our Lord Himself were the only (one that bore) witness to Himself; whereas the truth was that He had, before His incarnation, sent many witnesses to prophesy of His Sacraments.
Or it is as if He said, If your law admits the testimony of two men who may be deceived, and testify to more than is true; on what grounds can you reject Mine and My Father's testimony, the highest and most sure of all?