6 Bible Verses about Mercy Killings

Which smote great kings! For his mercy endureth forever. Yea, and slew mighty kings! For his mercy endureth forever. Sihon, king of the Amorites! For his mercy endureth forever.read more.
And Og, the king of Bashan! For his mercy endureth forever.

"Thou shalt not kill.

Then shall he kill the goat that is the people's sin offering, and bring his blood within the veil, and do with his blood as he did with the blood of the ox, and let him sprinkle it toward the mercy seat, and before the mercy seat:

For there shall be judgment, merciless, to him that showeth no mercy, and mercy rejoiceth against judgment.

He smote divers nations, and slew mighty kings -

and said, "My soul die with the Philistines," and bowed them with might. And the house fell upon the lords and upon all the people that were therein. And so the dead which he slew at his death, were more than they which he slew in his life.