A man with an unclean spirit - There are two mentioned by Matthew, who are termed demoniacs. See on Mark 1:23 (note).

And when he was come out of the ship, immediately there met him out of the tombs a man (b) with an unclean spirit,
(b) Literally, "in an unclean spirit"; now they are said to be in the spirit because the spirit holds them tightly locked up, and as it were bound.

And when he was come out of the ship,.... As soon as he was landed,
immediately there met him out of the tombs, a man with an unclean spirit. The Jews have a notion, that a man by dwelling among the tombs, becomes possessed with an unclean spirit: hence they say of one that seeks to the dead, or a necromancer (o), this is he that starves himself, and goes "and lodges in the tombs"; , "that so an unclean spirit may dwell upon him": which notion may arise from unclean spirits hurrying persons possessed by them, unto such places; partly for the terror, both of themselves and others; and partly to possess the minds of men with a persuasion, that they have power over the dead, and which is very great in such places. This case is the same with that, which is mentioned in Matthew 8:28 as appears partly from its following the storm, from which the disciples had a remarkable deliverance; and partly from the country, in which this affair happened; for the country of the Gergesenes, and of the Gadarenes, is the same, as has been observed; only it is called by different names, from two principal places in it: as also from various circumstances in this relation; as the character of the possessed being exceeding fierce, dwelling among the tombs, and coming out from thence; the expostulation of the devil with Christ, and adjuration not to torment him; his entreaty to go into the herd of swine, and the leave he had; the destruction of the swine in the sea; the fear and flight of the swine herds; the report they made to their masters and others; and the request of the people in general to Christ, that he would depart out of their coasts. And though Matthew makes mention of two that were possessed, and Mark but of one, there is no contradiction in the one to the other; for Mark does not say there were no more than one; had he, it would have been a glaring contradiction to the other evangelist; but as he has put it, there is none, and it creates no difficulty: wherefore the Jew (p) has no reason to object this as he does, as if the evangelists clashed with one another; and Mark may only take notice of this one, because he was the fiercest of the two, and had the most devils in him, having a legion of them; and because the conversation chiefly passed between Christ and him; and because the power of Christ was more manifestly seen in the dispossession of the devils out of him.
(o) T. Bab. Sanhedrin, fol. 65. 2. Nidda, fol. 17. 1. & Chagiga, fol. 3. 2. (p) Jacob Aben Amram, porta veritatia, No. 1028. apud Kidder's Demonstr. of the Messiah, par. 3. p. 51.

And when he was come out of the ship, immediately--(see Mark 5:6).
there met him a man with an unclean spirit--"which had devils [demons] long time" (Luke 8:27). In Matthew (Matthew 8:28), "there met him two men possessed with devils." Though there be no discrepancy between these two statements--more than between two witnesses, one of whom testifies to something done by one person, while the other affirms that there were two--it is difficult to see how the principal details here given could apply to more than one case.

There met him out of the tombs. The tombs are still seen in the cliff near Gersa. For notes on demoniacal possession and this account see Matthew 8:28-33. Compare Luke 8:26-39.

There met him a man with an unclean spirit - St. Matthew mentions two. Probably this, so particularly spoken of here, was the most remarkably fierce and ungovernable.