Job 9:33-35 NIV
33 If only there were someone to mediate between us,
someone to bring us together,
34someone to remove God’s rod from me,
so that His terror would frighten me no more.
35Then I would speak up without fear of Him,
but as it now stands with me, I cannot.
The word as used by Job (מוֹכִ֑יחַ mō·w·ḵî·aḥ) does not mean ‘mediator’, but ‘arbiter’, ‘umpire’, or ‘judge’; one before whom the cause might be tried, who could lay the hand of restraint on either party, who could confine the pleadings within proper bounds, who could preserve the parties within the limits of order, and who had power to determine the question at issue.
Job complains that there could be no such tribunal. He feels that God was so great that the cause could be referred to no other, and that he had no prospect of success in the unequal contest. It does not appear, therefore, that he desired a mediator, in the sense in which we understand that word - one who shall come between us and God, and manage our cause before Him, and be our advocate at His Tribunal.
He rather says that there was no one above God, or no umpire uninterested in the controversy, before whom the cause could be argued, and who would be competent to decide the matter in issue between him and his Maker. He had no hope, therefore, in a cause where one of the parties was to be the Judge, and where that party was Omnipotent; and he must give up the cause in despair.
It is not with strict sense that this language is ever applied to the Lord Jesus, the Great Mediator between God and man. He is not an Umpire to settle a dispute, in the sense in which Job understood it. He is not an Arbiter, to Whom the cause in dispute between man and his Maker is to be referred. He is not a judge to listen to the arguments of the respective parties, and to decide the controversy. He is a Mediator between us and God, to make it proper or possible that God should be reconciled to the guilty, and to propose to man the terms of reconciliation; to plead our case before God, and to communicate to us the favors which He proposes to bestow on man.