'Show Mercy' in the Bible

He said, "I will make all my goodness pass before you, and will proclaim the name of the LORD before you. I will be gracious to whom I will be gracious, and will show mercy on whom I will show mercy."

and when the LORD your God shall deliver them up before you, and you shall strike them; then you shall utterly destroy them: you shall make no covenant with them, nor show mercy to them;

to show mercy towards our fathers, to remember his holy covenant,