John Gill Bible Commentary

So the devils besought him, saying,.... All the devils, the whole legion of them, who perceiving that they must be obliged to go out of these men, and after they had earnestly entreated they might not be sent out of the country where they had long been, and had made themselves masters of the tempers, dispositions, and circumstances of the inhabitants, and so capable of doing the more mischief, begged hard, if thou cast us out of these men, or "from hence", as the Vulgate Latin, the Ethiopic, and Munster's Hebrew Gospel read, or "out of our place", as the Persic; since we must depart, and cannot be allowed to enter into other men, suffer us to go away into the herd of swine. This request shows the weakness of the infernal spirits, they are not able to do anything without leave, and the superior power of Christ over them, and their acknowledgment of it; as well as the wretched malignity of their nature, who must be doing mischief, if not to the bodies and souls of men, yet to their property and goods; and if they cannot vent their malice on rational creatures, are desirous of doing it on irrational ones. Many reasons have been thought of, why the devils should desire to go into the herd of swine; as because of the filthiness of these creatures, these impure spirits delighting in what is impure; or out of pure hatred to the inhabitants of this country, who, because they could no longer hurt their persons, would destroy their goods; or that by so doing, they might set the people against Christ, and so prevent his usefulness among them; which last seems to be the truest reason, and which end was answered.