19 And the flesh that toucheth any unclean thing shall not be eaten; it shall be burnt with fire: and as for the flesh, all that be clean shall eat thereof.

20 But the soul that eateth of the flesh of the sacrifice of peace offerings, that pertain unto the Lord, having his uncleanness upon him, even that soul shall be cut off from his people.

21 Moreover the soul that shall touch any unclean thing, as the uncleanness of man, or any unclean beast, or any abominable unclean thing, and eat of the flesh of the sacrifice of peace offerings, which pertain unto the Lord, even that soul shall be cut off from his people.

These verses emphasize the separation that there must be between unclean and clean. If part of an offering touches that which is unclean it is now also unclean and must be burned with the unclean parts. Given that different parts of the same animal were clean and unclean, one could easily see how this might happen on a fairly regular basis.

It is also made clear that sometimes people go through unclean periods. These will be spelled out more later, but symbolically it is observably true that we all go through times of guilt and shame, times where we have done things that we know we shouldn’t have, times where we feel out-of-place among the innocent and pure. Verses 20 and 21 make it clear that if we then did mingle ourselves with the pure, that would be living in a spiritually disingenuous way, and that is actually worse than the original uncleanness.

This brings up a theme that I have been noticing during this study of Leviticus. We are so often told that the Old Testament and the Mosaic Law are strict and demanding and cruel, oppressive laws that we are much better off to be rid of. But that isn’t what I’ve seen at all. What I’ve seen is a law that understands and accepts the fact that its people will sin, and which asks them to just be honest when they are in that condition, and to excuse themselves in those moments without shame. So long as an Israelite was honest about his failures, the law was perfectly willing to work with him, to allow him time to become clean and whole again.