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Job 31:10BSB·author unknown

then may my own wife grind grain for another, and may other men sleep with her.

Matthew Henry Presbyterian @wholebiblehenry

Two more instances we have here of Job's integrity: - I. That he had a very great abhorrence of the sin of adultery. As he did not wrong his own marriage bed by keeping a concubine (he did not so much as think upon a maid, v. 1), so he was careful not to offer any injury to his neighbour's marriage bed. Let us see here, 1.

Commenting on Job 31:9-15

John Gill Reformed Baptist @doctorgill

For this is an heinous crime,.... Adultery; it is contrary to the light of nature, and is condemned by it as a great sin, Gen 20:9; as well as contrary to the express will and law of God, Exo 20:14; and, though all sin is a transgression of the law of God, and deserving of death; yet there are some sins greater and more heinous...

Jamieson-Fausset-Brown Reformed @jfbcommentary

grind--turn the handmill. Be the most abject slave and concubine (Isa 47:2; Sa2 12:11).