Reference

Leviticus 13:12

And if a leprosy break out abroad in the skin, and the leprosy cover all the skin of him that hath the plague from his head even to his foot, wheresoever the priest looketh;
10

And the priest shall see him: and, behold, if the rising be white in the skin, and it have turned the hair white, and there be quick raw flesh in the rising;

11

It is an old leprosy in the skin of his flesh, and the priest shall pronounce him unclean, and shall not shut him up: for he is unclean.

12

And if a leprosy break out abroad in the skin, and the leprosy cover all the skin of him that hath the plague from his head even to his foot, wheresoever the priest looketh;

13

Then the priest shall consider: and, behold, if the leprosy have covered all his flesh, he shall pronounce him clean that hath the plague: it is all turned white: he is clean.

14

But when raw flesh appeareth in him, he shall be unclean.

Counter-Arguments

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

Symbolic / Spiritual Interpretation

The verse describes a physical skin condition ("leprosy break out abroad in the skin") and its physical extent ("from his head even to his foot"), focusing on observable symptoms for priestly inspection, not on any underlying spiritual state or moral purity.