'Mercy' in the Bible

Then the angel of the Lord, answering, said, O Lord of armies, how long will it be before you have mercy on Jerusalem and on the towns of Judah against which your wrath has been burning for seventy years?

This is what the Lord of armies has said: Let your judging be upright and done in good faith, let every man have mercy and pity for his brother:

And I will make the children of Judah strong, and I will be the saviour of the children of Joseph, and I will make them come back again, for I have had mercy on them: they will be as if I had not given them up: for I am the Lord their God and I will give them an answer.