Jamieson, Fausset and Brown on Job 33:23

23. Elihu refers to himself as the divinely-sent (Job 32:8; 33:6) "messenger," the "interpreter" to explain to Job and vindicate God's righteousness; such a one Eliphaz had denied that Job could look for (Job 5:1), and Job (Job 9:33) had wished for such a "daysman" or umpire between him and God. The "messenger" of good is antithetical to the "destroyers" (Job 33:23).

with him--if there be vouchsafed to the sufferer. The office of the interpreter is stated "to show unto man God's uprightness" in His dealings; or, as Umbreit, "man's upright course towards God" (Pr 14:2). The former is better; Job maintained his own "uprightness" (Job 16:17; 27:5, 6); Elihu on the contrary maintains God's, and that man's true uprightness lies in submission to God. "One among a thousand" is a man rarely to be found. So Jesus Christ (So 5:10). Elihu, the God-sent mediator of a temporal deliverance, is a type of the God-man Jesus Christ the Mediator of eternal deliverance: "the messenger of the covenant" (Mal 3:1). This is the wonderful work of the Holy Ghost, that persons and events move in their own sphere in such a way as unconsciously to shadow forth Him, whose "testimony is the Spirit of prophecy"; as the same point may be center of a small and of a vastly larger concentric circle.