Reference

Leviticus 14:48

And if the priest shall come in, and look upon it, and, behold, the plague hath not spread in the house, after the house was plaistered: then the priest shall pronounce the house clean, because the plague is healed.
46

Moreover he that goeth into the house all the while that it is shut up shall be unclean until the even.

47

And he that lieth in the house shall wash his clothes; and he that eateth in the house shall wash his clothes.

48

And if the priest shall come in, and look upon it, and, behold, the plague hath not spread in the house, after the house was plaistered: then the priest shall pronounce the house clean, because the plague is healed.

49

And he shall take to cleanse the house two birds, and cedar wood, and scarlet, and hyssop:

50

And he shall kill the one of the birds in an earthen vessel over running water:

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Pre-Law Clean/Unclean Distinction

This verse is found within the book of Leviticus, which is part of the Mosaic Law given at Sinai, therefore it describes a clean/unclean distinction *within* the Law, not *before* it.

Symbolic / Spiritual Interpretation

The verse describes a literal physical inspection of a house for a literal physical "plague" (likely mold or mildew) and a literal declaration of its cleanliness, with no linguistic indicators suggesting a symbolic or spiritual meaning for "clean" or "plague."