And one of them, etc. It is uncertain if he returned when they were halfway, and Luke's words appear to imply this; but I think it more probable, that it was not till he had heard the decision of the priests that he returned to give thanks. He must have obtained permission from the priests to return to the ordinary intercourse of life; and he had no right to neglect the command of Christ, and to defraud the temple of God of a sacrifice. Some will perhaps be better pleased with a different conjecture, that as soon as he saw that he was cleansed, and before he applied to the priests for a testimony, he was seized with a devout and holy zeal, and returned to the Author of the cure, so as to commence his sacrifice with thanksgiving. The words of Christ contain an expostulation with the whole nation; for it is by way of reproach that he draws a comparison between one stranger and many Jews, because it was customary with them to swallow up God's favors without any feeling of piety. And this was the reason why Christ gained hardly any reputation among them by miracles so numerous and so splendid. Let us learn that this complaint is brought generally against all of us, if we do not at least repay the divine favors by the duty of gratitude.

One of them - This man, sensible of the power of God and grateful for his mercies, returned to express his gratitude to God for his goodness. Instead of obeying "at once" the "letter" of the command, he "first" expressed his thanks to God and to his Great Benefactor. There is no evidence, however, that he did not, "after" he had given thanks to God, and had poured out his joy at the feet of Jesus, go to the priest as he was directed; indeed, he could not have been restored to society without doing it; but he "first" poured out his thanks to God, and gave him praise for his wonderful recovery. The first duty of sinners, after they have been forgiven and have the hope of eternal life, is to prostrate themselves at the feet of their Great Benefactor, and to consecrate themselves to his service. "Then" let them go and show to others the evidence that they are cleansed. Let them go and mingle, like a restored leper, with their families and friends, and show by the purity and holiness of their lives how great is the mercy that has cleansed them.
He was a Samaritan - See the notes at Matthew 10:5. This rendered his conduct more remarkable and striking in the sight of the Jews. "They" considered the Samaritans as especially wicked, and "themselves" as especially holy. This example showed them, like the parable of the good Samaritan, that in this they were mistaken: and one design of this seems to have been to break down the "opposition" between the Jews and Samaritans, and to bring the former to more charitable judgments respecting the latter.

One of them, when he saw that he was healed, etc. - It seems that he did not wait to go first to the priest, but turned immediately back, and gave public praise to the kind hand from which he had received his cure.

And one of them, when he saw that he was healed.... When he felt perfect soundness in his body, and perceived that he was restored to his health, and saw with his eyes that the leprosy was gone from him, which must be visible enough:
turned back; either immediately, before he went to the priests; or afterwards, came back to Jesus, when he bad been with them:
and with a loud voice glorified God; Jesus Christ, who is truly God, and whose proper divinity might be seen in this miracle; see 2-Kings 5:7 or God the Father, through Christ, and for his sake, by ascribing his cure to his power, and by returning thanks for it, and acknowledging with gratitude, Christ to be the author of it; which he did, with as loud a voice, as he cried to him for mercy; that all might know the miracle that was wrought, and join in giving glory to Christ: and it was but one of them that did so; gratitude is a rare thing, it is found but in few; unthankfulness cleaves to most persons; it is the general character of men to be unthankful and unholy; multitudes, even all men, share in the providential goodness of God, yet few take notice of, and are thankful for it; God is therefore said to be good, to the unthankful and to the evil, Luke 6:35. Few there are who are of Jacob's spirit, that judge themselves unworthy of the least of mercies, and are heartily thankful for every favour: and this the leper did, when he was sensible that he was healed; no man will seek after a cure, till he sees, or is sensible of his sickness and his wound; and when he does, he will inquire after, and make use of the proper means of healing; and when he has got a cure, he is, or at least ought to be, thankful for it: and so it is in spiritual things, the whole need not a physician, or see no need of the physician, Christ; but those who are sick, and sensible of the sickness of sin, do; and when they perceive that their diseases are healed, and their sins forgiven, then they call upon their souls, and all within them, to bless the Lord, who has done this for them: and it becomes such who are cured of the leprosy of sin, to glorify God; not only with their mouths, by bringing their offering and sacrifice of praise to him, as the leper by the law was obliged to bring his offering, at the time of his cleansing; but by deeds also, with their bodies, and with their spirits; by a holy, humble, and spiritual conversation before men, signified by the leper's washing himself, and clothes, and shaving off all his hair; and by attending on the word and ordinances, by a professed subjection to the Gospel of Christ, signified by the blood being put upon the tip of the right ear of the leper, and on the thumb of his right hand, and on the great toe of his right foot, Leviticus 14:14.