"But if you do not drive out the inhabitants of the land from before you, then those you let remain of them will be as pricks in your eyes and as thorns in your sides, and they will harass you in the land in which you dwell.

"'So you shall not pollute the land in which you are: for blood, it pollutes the land; and no expiation can be made for the land for the blood that is shed therein, but by the blood of him who shed it.