Charles Ellicott Commentary Job 31:38

"If my land crieth out against me, And the furrows thereof weep together;" — Job 31:38 (ASV)

Or that its furrows also complain.—Rather, Or if its furrows weep together—a strong personification to express the consequence of oppression and wrongdoing.

It should be noted that throughout this defense, Job has done far more than refute the charges of his friends. He has shown that he has not only refrained from violating the moral law, as they insinuated, but, much more, has shown himself exemplary in all relationships of life. Consequently, according to the narrator of the history, he was not only one who feared God and eschewed evil (Job 1:1), but was also perfect, i.e., of sincere and consistent conduct and upright.