'Mercy' in the Bible

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

Thus speaketh the LORD of hosts, saying, Execute true judgment, and shew mercy and compassions every man to his brother:

And I will strengthen the house of Judah, and I will save the house of Joseph, and I will bring them again to place 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.