(8) For he said unto him.—The Greek verb is in the imperfect tense, he was saying, as though the demoniac had interrupted our Lord even while the words were in the act of being uttered.

Thou unclean spirit.—It is noticeable that our Lord first speaks as if the men were oppressed by a single demon only, and that it is in the answer of the man himself that we learn that their name was Legion. (On the man’s use of the word “Legion,” see Note on Matthew 8:29.)

5:1-20 Some openly wilful sinners are like this madman. The commands of the law are as chains and fetters, to restrain sinners from their wicked courses; but they break those bands in sunder; and it is an evidence of the power of the devil in them. A legion of soldiers consisted of six thousand men, or more. What multitudes of fallen spirits there must be, and all enemies to God and man, when here was a legion in one poor wretched creature! Many there are that rise up against us. We are not a match for our spiritual enemies, in our own strength; but in the Lord, and in the power of his might, we shall be able to stand against them, though there are legions of them. When the vilest transgressor is delivered by the power of Jesus from the bondage of Satan, he will gladly sit at the feet of his Deliverer, and hear his word, who delivers the wretched slaves of Satan, and numbers them among his saints and servants. When the people found that their swine were lost, they had a dislike to Christ. Long-suffering and mercy may be seen, even in the corrections by which men lose their property while their lives are saved, and warning given them to seek the salvation of their souls. The man joyfully proclaimed what great things Jesus had done for him. All men marvelled, but few followed him. Many who cannot but wonder at the works of Christ, yet do not, as they ought, wonder after him.Worshipped him - Bowed down before him; rendered him homage. This was an acknowledgment of his power, and of his control over fallen spirits.8. For he said unto him—that is, before the unclean spirit cried out.

Come out of the man, unclean spirit!—Ordinarily, obedience to a command of this nature was immediate. But here, a certain delay is permitted, the more signally to manifest the power of Christ and accomplish His purposes.

See Poole on "Mark 5:1"

For he said unto him,.... Or he had said unto him, as soon as he came up to him, and fell before him; even before he had confessed, and adjured him; and which indeed drew out the confession from him, that he was superior to him, and therefore became his supplicant:

come out of the man, thou unclean spirit; which was said with so much authority and power, that there was no withstanding it: the devil knew he was not a match for him; that he must, at his command, quit his possession, and therefore fell to confession and entreaty. Christ will not dwell where Satan does; when therefore he is about to take up his residence in the hearts of any, he outs with Satan; he binds the strong man armed, and dispossesses him; he causes the spirit of uncleanness to depart; he sanctifies the heart by his grace and Spirit, and so makes it a proper habitation for him to dwell in by faith; and this is done by mighty power: a man cannot deliver himself out of the hands of Satan, or cause him to quit his hold of him, or the unclean spirit to depart; nor can he sanctify and cleanse himself, and make himself meet for the master's use: this is all owing to efficacious grace.

For he said unto him, Come out of the man, thou unclean spirit.