Numbers 35:33-34

331So you shall not pollute the land in which you are; for blood pollutes the land and no expiation can be made for the land for the blood that is shed on it, except 2by the blood of him who shed it.

34You shall not 3defile the land in which you live, in the midst of which 4I dwell; for I the Lord am dwelling in the midst of the sons of Israel.’”