'Mercy' in the Bible

Then the children of Judah made an attack on Jerusalem, and took it, burning down the town after they had put its people to the sword without mercy.

And they took that which Micah had made, and his priest, and came to Laish, to a people living quietly and without thought of danger, and they put them to the sword without mercy, burning down their town.

And the watchers, rushing on Gibeah and overrunning it, put all the town to the sword without mercy.

And the men of Israel, turning again against the children of Benjamin, put to the sword without mercy all the towns and the cattle and everything there was, burning every town which came into their hands.

So they (the meeting) sent twelve thousand of the best fighting-men, and gave them orders, saying, Go and put the people of Jabesh-gilead to the sword without mercy, with their women and their little ones.