If I be wicked, why then labour I in vain?
Job here grows more and more querulous, and does not conclude this chapter with such reverent expressions of God's wisdom and justice as he began with. Those that indulge a complaining humour know not to what indecencies, nay, to what impieties, it will hurry them. The beginning of that strife with God is as the letting forth of water; therefore leave it off before it be meddled with.
Commenting on Job 9:25-35
If I wash myself with snow water,.... As it came from heaven, or flowed from the mountains covered with snow, as Lebanon, see Jer 18:14; or was kept in vessels for such use, as being judged the best for such a purpose; so it was used by the ancients (n), as being what whitens the skin, and strengthens the parts by contracting the pores, and...
The "if" is better omitted; I (am treated by God as) wicked; why then labor I in vain (to disprove His charge)? Job submits, not so much because he is convinced that God is right, as because God is powerful and he weak [BARNES].