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Job 19:4ESV·author unknown

And even if it be true that I have erred, my error remains with myself.

Matthew Henry Presbyterian @wholebiblehenry

Job's friends had passed a very severe censure upon him as a wicked man because he was so grievously afflicted; now here he tells them how ill he took it to be so censured. Bildad had twice begun with a How long (Job 8:2, Job 18:2), and therefore Job, being now to answer him particularly, begins with a How long too, Job 19:2.

Commenting on Job 19:1-7

John Gill Reformed Baptist @doctorgill

If indeed ye will magnify yourselves against me,.... Look and talk big, set up themselves for great folk, and resolve to run him down; open their mouths wide against him and speak great swelling words in a blustering manner; or magnify what they called an error in him, and set it out in the worst light they could: and plead against me my reproach; his...

Jamieson-Fausset-Brown Reformed @jfbcommentary

erred--The Hebrew expresses unconscious error. Job was unconscious of wilful sin. remaineth--literally, "passeth the night." An image from harboring an unpleasant guest for the night. I bear the consequences.