He will surely rebuke you if in secret you show partiality.
Job here warmly expresses his resentment of the unkindness of his friends. I. He comes up with them as one that understood the matter in dispute as well as they, and did not need to be taught by them, Job 13:1, Job 13:2. They compelled him, as the Corinthians did Paul, to commend himself and his own knowledge, yet not in a way of self-applause, but of self-justification.
Commenting on Job 13:1-12
He will surely reprove you,.... Or "in reproving he will reprove you" (r); he will certainly do it, it may be depended upon, and be expected; he will never suffer sin to go unreproved and uncorrected; he will do it to the purpose, with sharpness and severity, as the nature of the crime requires; he reproves by his spirit, and it is well for men...
If ye do, though secretly, act partially. (See on Job 13:8; Psa 82:1-2). God can successfully vindicate His acts, and needs no fallacious argument of man.