I believe Elihu is the writer of this book as he speaks in the first person. Job asks for a mediator who was made of clay. Job had said God would laugh at the trial of the innocent. (Job 9:23)
Elihu and God
Compare these verses carefully.
Elihu said, “Job hath spoken without knowledge, and his words were without wisdom.” Job 34:35
Elihu said, “Therefore doth Job open his mouth in vain: he multiplieth words without knowledge.” Job 35:16
The Lord said, “Who is this that darkeneth counsel by words without knowledge?” Job 38:2
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Elihu said, “If thou canst answer me, set they words in order before me, stand up.” Job 33:5
The Lord said, “Gird up now thy loins like a man; for I will demand of thee, and answer thou me.” Job 38:3
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Elihu said, “Hearken unto this, O Job: stand still, and consider the wondrous works of God. Dost thou know when God disposed them, and caused the light of his cloud to shine? Dost thou know the balancings of the clouds, the wondrous works of him which is perfect in knowledge? Job 37:14-16
The Lord said, “Knowest thou the ordinances of heaven? Canst thou set the dominion therof in the earth? Canst thou lift up they voice to the clouds, that abundance of waters may cover thee?” Job 38:33-34
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Elihu said, “Shall even he that hateth right govern? And wilt thou condemn him that is most just?” Job 34-17
The Lord said, “Shall he that contendeth with the Almighty instruct him? He that reproveth God, let him answer it.” Job 40:2
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Elihu said, “Then was kindled the wrath of Elihu the son of Barachel the Buzite, of the kindred of Ram: against Job was his wrath kindled, because he justified himself rather than God.” Job 32:2
Elihu said, “Thinkest thou this to be right, that thou saidst, my righteousness is more than God’s?” Job 35:2
The Lord said, “Wilt thou also disannul my judgment? Wilt thou condemn me, that thou mayest be righteous?” Job 40:8
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In every case Elihu said it first and the Lord repeated.