Reference

Numbers 19:22

And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth it shall be unclean until even.
20

But the man that shall be unclean, and shall not purify himself, that soul shall be cut off from among the congregation, because he hath defiled the sanctuary of the Lord: the water of separation hath not been sprinkled upon him; he is unclean.

21

And it shall be a perpetual statute unto them, that he that sprinkleth the water of separation shall wash his clothes; and he that toucheth the water of separation shall be unclean until even.

22

And whatsoever the unclean person toucheth shall be unclean; and the soul that toucheth it shall be unclean until even.

Counter-Arguments

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

Levitical Dietary Law

This verse deals with ritual uncleanness due to contact with an "unclean person" and its effects, not with the consumption of specific animals or the codification of dietary rules.

Symbolic / Spiritual Interpretation

The verse explicitly deals with ritual impurity and its physical transmission, stating that contact with an "unclean person" makes other objects and individuals ritually "unclean" until evening. There is no language within the verse itself that suggests a symbolic or spiritual meaning beyond this literal, ritualistic understanding of clean and unclean.