Albert Barnes Commentary Job 16:17

"Although there is no violence in my hands, And my prayer is pure." — Job 16:17 (ASV)

Not for any injustice ... - Still claiming that he does not deserve his sorrows, and that these calamities had not come upon him on account of any enormous sins, as his friends believed.

My prayer is pure - My devotion; my worship of God is not hypocritical - as my friends maintain.