Midrash su Levitico 14:49

12) Whence is it derived that if (after remaining the same at the end of the first week and having been quarantined for a second week), it (was found to have) dimmed in the second week or disappeared (entirely), he peels (the site of the spot) and he requires birds (for its cleansing)? From (Vayikra 13:49) "And he shall take to cleanse the house two birds, etc." This is one house … — whence they ruled: There are ten houses (in this connection): If it dims in the first week or disappears, he peels it and it is tahor (clean). If it dims in the second week or disappears, he peels it and he requires birds. If it spreads in the first week, he removes, scrapes, and plasters, and is given an additional week. If it returns, he razes (the house). If it does not return, he requires birds. If it remained the same in the first week and spread in the second week, he removes, scrapes, and smears, and is given an additional week. If it returned, he razes; if not, he requires birds. If it remained the same both the first week and the second, he removes, scrapes, and plasters, and is given an additional week. If it returned, he razes; if not, he requires birds.

12) (Vayikra 13:59) ("This is the law of the plague-spot of leprosy, in a garment of wool or linen, or in the warp, or in the woof, or in any article of skin, to declare it clean or to declare it unclean.") "This is the plague-spot of leprosy, etc.": (Vayikra 14:54) ("This is the law for all plague-spots or leprosy and for a nethek (Vayikra 14:55) and for the leprosy of a garment and of a house.") They (plague-spot garments) are being likened to a house, viz., Just as a house is rendered unclean by the entry (of an unclean person), so it is rendered unclean by the entry of all (plague-spot garments). — But perhaps just as a house requires birds (for its cleansing, [viz. Vayikra 14:49]), so all (plague-spot garments) should require birds (for their cleansing)! It is, therefore, written "This" (i.e., only in this respect [that of "entry"] are they similar, and not in the other.) Rebbi says: It is written "This is the law for all plague-spots of leprosy and for a nethek and for the leprosy of a garment and of a house." Just as a house renders unclean by entry, so all are rendered unclean by entry. This tells me only of a garment. Whence do I derive all of them (i.e., warp and woof, etc.) for inclusion? From "This is the law of the plague-spot of leprosy … in the warp or in the woof, etc." Just as a garment renders unclean by entry, so all (i.e., warp and woof, etc.) render unclean by entry. — But perhaps just as a garment is rendered unclean by all that are tamei (e.g., sheratzim, semen, etc.), so all (warp and woof etc.) are rendered unclean by all that are tamei! It is, therefore, written "This" (and not the others).