Charles Ellicott Commentary Job 7:20

"If I have sinned, what do I unto thee, O thou watcher of men? Why hast thou set me as a mark for thee, So that I am a burden to myself?" — Job 7:20 (ASV)

I have sinned — i.e., “Putting the case that I have sinned, yet what then can I do to You, O You keeper of men?” with a possible allusion to Job 7:12, though the verb is not the same.

O thou preserver of men. —“Why have You set me as a mark for You to expend all Your arrows upon?” or, “Why have You made me to be Your stumbling-block, so that You always come into collision against me, so that I have become a burden to myself?”