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--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.