Genesis 37:21

21.And Reuben heard it. It may be well to observe, while others were hastening to shed his blood, by whose care Joseph was preserved. Reuben doubtless, in one affair, was the most wicked of them all, when he defiled his father’s couch; and that unbridled lust, involving other vices, was the sign of a depraved nature: now suddenly, he alone, having a regard to piety, and being mindful of fraternal duty, dissolves the impious conspiracy. It is uncertain whether he was now seeking the means of making some compensation, for the sake of which he might be restored to his father’s favor. Moses declares that it was his intention to restore the boy in safety to his father: whence the conjecture which I have stated is probable, that he thought the life of his brother would be a sufficient price by which he might reconcile his father’s mind to himself. However this may be, yet the humanity which he showed in attempting to liberate his brother, is a proof that he was not abandoned to every kind of wickedness. And perhaps God, by this testimony of his penitence, designed in some degree to lessen his former disgrace. Whence we are taught that the characters of men are not to be estimated by a single act, however atrocious, so as to cause us to despair of their salvation.