'Mercy' in the Bible

and when Jehovah thy God shall deliver them up before thee, and thou shalt smite them; then thou shalt utterly destroy them: thou shalt make no covenant with them, nor show mercy unto them;

And there shall cleave nought of the devoted thing to thy hand; that Jehovah may turn from the fierceness of his anger, and show thee mercy, and have compassion upon thee, and multiply thee, as he hath sworn unto thy fathers;