Reference

Leviticus 14:36

Then the priest shall command that they empty the house, before the priest go into it to see the plague, that all that is in the house be not made unclean: and afterward the priest shall go in to see the house:
34

When ye be come into the land of Canaan, which I give to you for a possession, and I put the plague of leprosy in a house of the land of your possession;

35

And he that owneth the house shall come and tell the priest, saying, It seemeth to me there is as it were a plague in the house:

36

Then the priest shall command that they empty the house, before the priest go into it to see the plague, that all that is in the house be not made unclean: and afterward the priest shall go in to see the house:

37

And he shall look on the plague, and, behold, if the plague be in the walls of the house with hollow strakes, greenish or reddish, which in sight are lower than the wall;

38

Then the priest shall go out of the house to the door of the house, and shut up the house seven days:

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 details the Mosaic Law given at Sinai, therefore it describes a distinction that is part of the Law, not one that existed prior to it.

Symbolic / Spiritual Interpretation

The verse describes a literal physical action (emptying a house) to prevent literal physical objects from being declared ritually unclean due to a literal physical "plague" in the house. There is no language in the verse itself that suggests a symbolic or spiritual meaning for "unclean" or "plague."