'Mercy' in the Bible

O give thanks unto the LORD; for he is good; for his mercy endureth for ever.

And with them Heman and Jeduthun, and the rest that were chosen, who were expressed by name, to give thanks to the LORD, because his mercy endureth for ever;

I will be his father, and he shall be my son: and I will not take my mercy away from him, as I took it from him that was before thee: