Reference

Leviticus 13:51

And he shall look on the plague on the seventh day: if the plague be spread in the garment, either in the warp, or in the woof, or in a skin, or in any work that is made of skin; the plague is a fretting leprosy; it is unclean.
49

And if the plague be greenish or reddish in the garment, or in the skin, either in the warp, or in the woof, or in any thing of skin; it is a plague of leprosy, and shall be shewed unto the priest:

50

And the priest shall look upon the plague, and shut up it that hath the plague seven days:

51

And he shall look on the plague on the seventh day: if the plague be spread in the garment, either in the warp, or in the woof, or in a skin, or in any work that is made of skin; the plague is a fretting leprosy; it is unclean.

52

He shall therefore burn that garment, whether warp or woof, in woollen or in linen, or any thing of skin, wherein the plague is: for it is a fretting leprosy; it shall be burnt in the fire.

53

And if the priest shall look, and, behold, the plague be not spread in the garment, either in the warp, or in the woof, or in any thing of skin;

Counter-Arguments

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

Seventh-Day Sabbath

The verse mentions "the seventh day" as a point in a sequence of observation for a plague, not as a day of rest or a Sabbath. There is no linguistic or contextual indication that "seventh day" here refers to the Sabbath.

Symbolic / Spiritual Interpretation

The verse describes a literal physical condition ("plague," "leprosy") affecting tangible items ("garment," "skin") and explicitly states it is "unclean" in a ritualistic sense, without any language suggesting a symbolic or spiritual meaning beyond this physical and ritualistic impurity.