'Show Mercy' in the Bible

And he said, I will make all my goodness pass before thee, and will proclaim the name of Jehovah before thee; and I will be gracious to whom I will be gracious, and will show mercy on whom I will show mercy.

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;

To show mercy towards, our fathers, And to remember his holy covenant;