Job 31:1

The lusts of the flesh, and the love of the world, are the two fatal rocks on which multitudes split; against these Job protests he was always careful to stand upon his guard. I. Against the lusts of the flesh. He not only kept himself clear from adultery, from defiling his neighbour's wives (Job 31:9), but from all lewdness with any women whatsoever. He kept no concubine, no mistress, but was inviolably faithful to the marriage bed, though his wife was none of the wisest, best, or kindest. From the beginning it was so, that a man should have but one wife and cleave to her only; and Job kept closely to that institution and abhorred the thought of transgressing it; for, though his greatness might tempt him to it, his goodness kept him from it. Job was now in pain and sickness of body, and under that affliction it is in a particular manner comfortable if our consciences can witness for us that we have been careful to preserve our bodies in chastity and to possess those vessels in sanctification and honour, pure from the lusts of uncleanness. Now observe here, 1.

— Matthew Henry's Concise Commentary (public domain)