Is not destruction to the wicked? - That is, Job says that he was well aware that destruction would overtake the wicked, and that if he had given indulgence to impure desires he could have looked for nothing else. Well knowing this, he says, he had guarded himself in the most careful manner from sin, and had labored with the greatest assiduity to keep his eyes and his heart pure.
And a strange punishment - - ונכר weneker. The word used here, means literally strangeness - a strange thing, something with which we were unacquainted. It is used here evidently in the sense of a strange or unusual punishment; something which does not occur in the ordinary course of events. The sense is, that for the sin here particularly referred to, God would interpose to inflict vengeance in a manner such as did not occur in the ordinary dealings of his providence. There would be some punishment adopted especially to this sin, and which would mark it with his special displeasure. Has it not been so in all ages? The Vulgate renders it, alienatio, and the Septuagint translates it in a similar manner - ἀπαλλοτρίωσις apallotriōsis - and they seem to have understood it as followed by entire alienation from God; an idea which would be every where sustained by a reference to the history of the sin referred to by Job. There is no sin that so much poisons all the fountains of pure feeling in the soul, and none that will so certainly terminate in the entire wreck of character.

Is not destruction to the wicked - If I had been guilty of such secret hypocritical proceedings, professing faith in the true God while in eye and heart an idolater, would not such a worker of iniquity be distinguished by a strange and unheard-of punishment?

[Is] not destruction to the wicked? and a strange [punishment] to (c) the workers of iniquity?
(c) Job declares that the fear of God was a bridle to stay him from all wickedness.

Is not destruction to the wicked?.... It is even to such wicked men, who live in the sin of fornication, and make it their business to ensnare and corrupt virgins; and which is another reason why Job was careful to avoid that sin; wickedness of every sort is the cause of destruction, destruction and misery are in the ways of wicked men, and their wicked ways lead unto it, and issue in it, even destruction of soul and body in hell, which is swift and sudden, and will be everlasting: this is laid up for wicked men among the treasures of God's wrath, and they are reserved that, and there is no way of deliverance from it but by Christ:
and a strange punishment to the workers of iniquity; the iniquity of fornication and whoredom, Proverbs 30:20; who make it their business to commit it, and live in a continued course of uncleanness and other sins; a punishment, something strange, unusual, and uncommon, as the filthy venereal disease in this world, and everlasting burnings in another; or "alienation" (y), a state of estrangement and banishment from the presence of God and Christ, and from the society of the saints, to all eternity; see Matthew 25:46.
(y) "et abalienatio", Munster; "et alienatio", V. L. Pagninus, Montanus, Mercerus, Drusius, Schmidt.

Answer to the question in Job 31:2.
strange--extraordinary.