Job 13:9

“Is it good that he should search you out? etc.] That is, God; searching is ascribed to him after the manner of men; not that he is ignorant of persons or things he searches after, or exercises that application, diligence, and industry, and takes those pains which are necessary in men to find out anything; when he makes search, it is not on his own account, but others; at least it is only to show his knowledge of persons and things, and to make men known to others, or things to them themselves; and is here to be understood in a judicial sense, as it frequently is the case, so it was here, a man that is “first in his own cause”, as the wise man says, (<201817>Proverbs 18:17), “seemeth just”;…”

“Will the issue to you be good, when He searches out you and your arguments? Will you be regarded by Him as pure and disinterested? mock-- (Gal 6:7). Rather, "Can you deceive Him as one man?" &c.”

“Is it good that he should search you out? - Would it be well for you if he should go into an investigation of your character, and of the arguments which you adduce? The idea is, that if God should make such an investigation, the result would be highly unfavorable to them. Perhaps Job means to intimate that, if they were subjected to the kind of trial that he had been, it would be seen that they could not bear it. “Or as one man mocketh another.” The idea here is, “it is possible to delude or deceive man, but God cannot be deceived. You may conceal your thoughts and motives from man, but you cannot from God. You may use arguments that may impose upon man - you may employ fallacies and…”

“search: Job 34:36; Psa 44:21, Psa 139:23; Jer 17:10 as one: Job 17:2; Isa 28:22; Gal 6:7, Gal 6:8 Job 13:10”