Job relates how he is an undeserved position of tribulation. He is coming before God in humility to request a reversal of his situation. He is forgiven and should not be tried according to his sins. To verify this, Job desires a witness in heaven who can defend him before God the judge. We have just this in the person of Jesus who is our heavenly witness providing testimony that we are forgiven our sins in him. We cannot be found guilty because our guilt is taken by Christ. Christ in turn gives us his righteousness. Therefore, in Christ's forgiveness, we are not guilty but righteous.