'Have Mercy' in the Bible

Then the angel of the LORD answered and said, O LORD of hosts, how long will you not have mercy on Jerusalem and on the cities of Judah, against which you have had indignation these threescore and ten years?

And I will strengthen the house of Judah, and I will save the house of Joseph, and I will bring them again to restore them; for I have mercy upon them: and they shall be as though I had not cast them off: for I am the LORD their God, and will hear them.