Job 36:4

“For truly my words [shall] not [be] false, etc.] But strictly true; he would take the utmost care to say nothing but the truth, with the greatest impartiality and sincerity, so that what was said might be depended upon; truth spoken briefly, clearly, and on so important a subject as the righteousness of God, deserved attention; he that is perfect in knowledge [is] with thee; meaning either God, whose knowledge is perfect, who knows all persons and things; knows himself, his nature, persons, and perfections; his thoughts, counsels, and purposes; all his creatures, angels and men; the hearts of all men, their thoughts, words, and works; he, the omniscient and omnipresent God was with Job, from…”

“I will not "speak wickedly for God," as the friends (Job 13:4, Job 13:7-8) --that is, vindicate God by unsound arguments. he that is perfect, &c.--Rather, as the parallelism requires, "a man of integrity in sentiments is with thee" (is he with whom thou hast to do). Elihu means himself, as opposed to the dishonest reasonings of the friends (Job 21:34).”

“For truly my words shall not be false - This is designed to conciliate attention. It is a professed purpose to state nothing but truth. Even in order to vindicate the ways of God he would state nothing but what would bear the most rigid examination. Job had charged on his friends a purpose “to speak wickedly for God;” to make use of unsound arguments in vindicating his cause, (see the notes at Job 13:7-8), and Elihu now says that “he” will make use of no such reasoning, but that all that he says shall be founded in strict truth. He that is perfect in knowledge is with thee - This refers undoubtedly to Elihu himself, and is a claim to a clear understanding of the subject. He did not doubt…”

“He, &c. - Thou hast to do with a God of perfect knowledge, by whom all thy words and actions are weighed. Job 36:5”

“36:4 I am a man of great knowledge (literally one who is perfect in knowledge is with you): Elihu was probably claiming to be completely sincere or saying that his logic was flawless.”

“my: Job 13:4, Job 13:7, Job 21:27, Job 21:34, 22:6-30; Pro 8:7, Pro 8:8; Co2 2:17 perfect: Job 37:16; Luk 1:3; Act 24:22; Co1 14:20 \*marg. Col 4:12; Ti2 3:16, Ti2 3:17 in: Psa 49:3; Pro 22:20, Pro 22:21 Job 36:5”