Numbers 35:33-34

“‘So you shall not pollute the land in which you are; for blood pollutes the land. No atonement can be made for the land for the blood that is shed in it, but by the blood of him who shed it.

You shall not defile the land which you inhabit, in the midst of which I dwell; for I, the LORD, dwell in the midst of the children of Israel.’”