13 The Pharisees challenged him, “Here you are, appearing as your own witness; your testimony is not valid.”

Read John 8:13 Using Other Translations

The Pharisees therefore said unto him, Thou bearest record of thyself; thy record is not true.
So the Pharisees said to him, "You are bearing witness about yourself; your testimony is not true."
The Pharisees replied, “You are making those claims about yourself! Such testimony is not valid.”