6 Bible Verses about Mercy Killings

To him that smote great kings, For, age-abiding, is his lovingkindness. And slew majestic kings, For, age-abiding, is his lovingkindness. Even Sihon, king of the Amorites, For, age-abiding, is his lovingkindness.read more.
Also Og, king of Bashan, For, age-abiding, is his lovingkindness.

Thou shalt not commit murder.

Then shall he slay the sin-bearing goat which is for the people, and bring in its blood, within the veil, - and do with its blood, as he did to the blood of the bullock, and shall sprinkle it, upon the propitiatory and before the propitiatory:

For, the judgment, will be without mercy, unto him that hath shewed no mercy: Mercy, boasteth, over judgment.

Who smote great nations, and slew mighty kings:

And Samson said - Let my soul die with the Philistines! And he bowed mightily, and the house fell upon the lords, and upon all the people that were therein. So the dead, whom he slew at his death, were more than they whom he slew in his life.