But if you do not drive out the inhabitants of the land from before you, then it shall come about that those whom you let remain of them will become as pricks in your eyes and as thorns in your sides, and they will trouble you in the land in which you live.

So 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 by the blood of him who shed it.