Job 19:4

And be it indeed that I have erred, mine error remaineth with myself.

Job 19:4 belongs to Job's reply to his friends, in which he pleads for pity and utters prophecies of Christ. Its setting is the dispute over suffering, in which his friends wrongly took affliction as proof of personal guilt. Job himself held to his integrity while unable to understand God's dealings with him.

In the verse he concedes only hypothetically that if he has erred, that error rests with himself alone. That conditional admission does not establish that he has sinned. Nor does it prove that his suffering was punishment for sin.