And thus thou shall do to them to cleanse them: sprinkle the water of expiation upon them, and let them cause a razor to pass over all their flesh, and let them wash their clothes, and cleanse themselves.

So ye shall not pollute the land in which ye are, for blood, it pollutes the land. And no expiation can be made for the land for the blood that is shed in it, but by the blood of him who shed it.