Jamieson, Fausset & Brown

If--Rather, "While (His) scourge slays suddenly (the wicked, Job 9:22), He laughs at (disregards; not derides) the pining away of the innocent." The only difference, says Job, between the innocent and guilty is, the latter are slain by a sudden stroke, the former pine away gradually. The translation, "trial," does not express the antithesis to "slay suddenly," as "pining away" does [UMBREIT].