Adam Clarke Bible Commentary
Out of the country - Strange that these accursed spirits should find it any mitigation of their misery to be permitted to exercise their malevolence in a particular district! But as this is supposed to have been a heathen district, therefore the demons might consider themselves in their own territories; and probably they could act there with less restraint than they could do in a country where the worship of God was established. See on Mar 5:1 (note).
Jamieson-Fausset-Brown Bible Commentary
And he besought him much that he would not send them away out of the country--The entreaty, it will be observed, was made by one spirit, but in behalf of many--"he besought Him not to send them, &c."--just as in Mar 5:9, "he answered we are many." But what do they mean by entreating so earnestly not to be ordered out of the country? Their next petition (Mar 5:12) will make that clear enough.
John Gill Bible Commentary
And he besought him much,.... The devil that was at the head of this legion, who had the rest under his command, he, in their name, and on their behalf, entreated Jesus with great earnestness. This shows the authority Christ has over the devils, and their subjection to him; they are not only obliged to quit their former possession, when he gives orders, but they cannot go any where else, or where they would, without his leave: though the man they were in could not be bound and held with chains and fetters of iron, through the great strength they put forth in him; yet these themselves are bound and held in chains, and cannot move without Christ's permission, or as he is pleased to lengthen out the chain unto them: and though they are no humble supplicants to him for grace and mercy, yet they are, that they may continue where they are; or be suffered to be somewhere else, to do mischief to the souls and bodies of men: and though they are such proud spirits, they be, they are very willing to humble themselves and in the most submissive and pressing manner ask a favour, even of him whom they hate, when they have an end to answer by doing injury to others; and in this, as well as in many other things, they are imitated by them who are truly called the children of the devil, and do the lusts of him their father.
That he would not send them away out of the country; that if he did think fit to dispossess them from that man, that however he would permit them to stay in that country, and not drive them wholly from thence; and which they might be the more desirous of, because it was an Heathen country, inhabited by the blind Gentiles, that knew not God, or apostate Jews, or both; among whom their power and authority were very great; and where they had long been, and had had a large experience of the tempers and dispositions of men, and knew how to bait their temptations with success.
Tyndale Open Study Notes
5:10-13 The spirits’ persistent begging shows Jesus’ mastery over them. They were permitted to enter a herd of about 2,000 pigs, whose presence marks this as Gentile territory. Some have focused on the economic loss of the pigs or have speculated about why Jesus let the demons destroy them, but Mark and his readers were interested in how Jesus saved the man.