'Have Mercy' in the Bible

Then the angel of Yahweh replied, "O Yahweh of Armies, how long will you not have mercy on Jerusalem and on the cities of Judah, against which you have had indignation these seventy years?"

"I will strengthen the house of Judah, and I will save the house of Joseph, and I will bring them back; for I have mercy on them; and they will be as though I had not cast them off: for I am Yahweh their God, and I will hear them.