'Mercy' in the Bible

They sang [responsively], praising and giving thanks to the Lord, saying, “For He is good, for His lovingkindness (mercy) toward Israel endures forever.” And all the people shouted with a great shout when they praised the Lord because the foundation of the house of the Lord was laid.

and has extended His mercy and lovingkindness to me before the king, his advisers, and all the king’s mighty officials. I was strengthened and encouraged, for the hand of the Lord my God was upon me, and I gathered together outstanding men of Israel to go up with me [to Jerusalem].

For we are slaves; yet our God has not abandoned us in our bondage, but has extended lovingkindness to us before the kings of Persia, to revive us to rebuild the house of our God, to repair the site of its ruins and to give us a wall [of protection] in Judah and Jerusalem.