| Clarke's Commentary on the Bible He shall shut it up seven days more - To give time for the spreading of the contagion, if it did exist there; that there might be the most unequivocal marks and proofs that the garment was or was not infected.
Gill's Exposition of the Entire BibleThen the priest shall command that they wash the thing wherein the plague is,.... The priest did not wash it himself, but ordered others to do it; and this was either the part in which the plague was, or the whole garment or skin in which it was; which may be typical of the washing of the garments of men in the blood of Christ, which cleanses from all sin, Revelation 7:14, and he shall shut it up seven days more: the garment or skin in which the leprosy was, or suspected to be, to see what alteration would be made by that time through the washing, whether the colour would be altered, or whether it would spread any more or not.
Geneva Study BibleThen the priest shall command that they wash the thing wherein the plague is, and he shall shut it up seven days more:
Matthew Henry's Concise Commentary13:47-59 The garment suspected to be tainted with leprosy was not to be burned immediately. If, upon search, it was found that there was a leprous spot, it must be burned, or at least that part of it. If it proved to be free, it must be washed, and then might be used. This also sets forth the great evil there is in sin. It not only defiles the sinner's conscience, but it brings a stain upon all he has and all that he does. And those who make their clothes servants to their pride and lust, may see them thereby tainted with leprosy. But the robes of righteousness never fret, nor are moth-eaten.
Matthew Henry's Whole Bible CommentaryVerses 47-59 This is the law concerning the plague of leprosy in a garment, whether linen or woollen. A leprosy in a garment, with discernible indications of it, the colour changed by it, the garment fretted, the nap worn off, and this in some one particular part of the garment, and increasing when it was shut up, and not to be got out by washing is a thing which to us now is altogether unaccountable. The learned confess that it was a sign and a miracle in Israel, an extraordinary punishment inflicted by the divine power, as a token of great displeasure against a person or family. 1. The process was much the same with that concerning a leprous person. The garment suspected to be tainted was not to be burnt immediately, though, it may be, there would have been no great loss of it; for in no case must sentence be given merely upon a surmise, but it must be shown to the priest. If, upon search, it was found that there was a leprous spot (the Jews say no bigger than a bean), it must be burnt, or at least that part of the garment in which the spot was, v. 52, 57. If the cause of the suspicion was gone, it must be washed, and then might be used, v. 58. 2. The signification also was much the same, to intimate the great malignity there is in sin: it not only defiles the sinner's conscience, but it brings a stain upon all his employments and enjoyments, all he has and all he does. To those that are defiled and unbelieving is nothing pure, Tit. 1:15. And we are taught hereby to hate even the garments spotted with the flesh, Jude 23. Those that make their clothes servants to their pride and lust may see them thereby tainted with a leprosy, and doomed to the fire, Isa. 3:18-24. But the ornament of the hidden man of the heart is incorruptible, 1 Pt. 3:4. The robes of righteousness never fret nor are moth-eaten. | 
