6 Bible Verses about Mercy Killings

To him who smote great kings: for his mercy endures for ever. And slew powerful kings: for his mercy endures for ever, Sihon king of the Amorites: for his mercy endures for ever:read more.
And Og the king of Bashan: for his mercy endures for ever:

Thou shalt not murder.

After that, he shall kill the goat of the sin of the people and bring its blood inside the veil and do with that blood as he did with the blood of the bullock and sprinkle it upon the seat of reconciliation and before the seat of reconciliation;

For judgment without mercy shall be done unto the one that has shown no mercy; and mercy boasts against judgment.

He who smote many Gentiles and slew mighty kings,

And Samson said, Let me die with the Philistines. And he pushed with all his might, and the house fell upon the cardinals and upon all the people that were in it. So the dead which he slew at his death were more than those which he slew in his life.