MN 86 is I think a very touching sutta about laying down violence for good. It involves an infamous killer who was out to kill Buddha.
I think it also bears to mention how Buddha was from a warrior caste. So he should know a thing or two about war and violence.
So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery.
Now at that time in the realm of King Pasenadi of Kosala there was a bandit named Aṅgulimāla. He was violent, bloody-handed, a hardened killer, merciless to living beings. He laid waste to villages, towns, and countries. He was constantly murdering people, and he wore their fingers as a necklace.
Then the Buddha robed up in the morning and, taking his bowl and robe, entered Sāvatthī for alms. Then, after the meal, on his return from almsround, he set his lodgings in order and, taking his bowl and robe, he walked down the road that led to Aṅgulimāla.
The cowherds, shepherds, farmers, and travelers saw him on the road, and said to him, “Don’t take this road, ascetic. On this road there is a bandit named Aṅgulimāla. He is violent, bloody-handed, a hardened killer, merciless to living beings. He has laid waste to villages, towns, and countries. He is constantly murdering people, and he wears their fingers as a necklace. People travel along this road only after banding closely together in groups of ten, twenty, thirty, forty, or fifty. Still they meet their end by Aṅgulimāla’s hand.” But when they said this, the Buddha went on in silence.
For a second time … and a third time, they urged the Buddha to turn back.
But when they said this, the Buddha went on in silence.
The bandit Aṅgulimāla saw the Buddha coming off in the distance, and thought, “Oh, how incredible, how amazing! People travel along this road only after banding closely together in groups of ten, twenty, thirty, forty, or fifty. Still they meet their end by my hand. But still this ascetic comes along alone and unaccompanied, like a conqueror. Why don’t I take his life?”
Then Aṅgulimāla donned his sword and shield, fastened his bow and arrows, and followed behind the Buddha. But the Buddha used his psychic power to will that Aṅgulimāla could not catch up with him no matter how hard he tried, even though the Buddha kept walking at a normal speed.
Then Aṅgulimāla thought, “Oh, how incredible, how amazing! Previously, even when I’ve chased a speeding elephant, horse, chariot or deer, I’ve always caught up with them. But I can’t catch up with this ascetic no matter how hard I try, even though he’s walking at a normal speed.”
He stood still and said, “Stop, stop, ascetic!”
“I’ve stopped, Aṅgulimāla—now you stop.”
Then Aṅgulimāla thought, “These ascetics who follow the Sakyan speak the truth. Yet while walking the ascetic Gotama says: ‘I’ve stopped, Aṅgulimāla—now you stop.’ Why don’t I ask him about this?”
Then he addressed the Buddha in verse:
“While walking, ascetic, you say ‘I’ve stopped.’ And I have stopped, but you tell me I’ve not. I’m asking you this, ascetic: how is it you’ve stopped and I have not?”
“Aṅgulimāla, I have forever stopped—I’ve laid aside violence towards all creatures. But you can’t stop yourself from harming living creatures; that’s why I’ve stopped, but you have not.”
“Oh, at long last a renowned great seer, an ascetic has followed me into this deep wood. Now that I’ve heard your verse on Dhamma, I shall live without evil.”
With these words, the bandit hurled his sword and weapons down a cliff into an abyss. He venerated the Holy One’s feet, and asked him for the going forth right away.
Then the Buddha, the compassionate great seer, the teacher of the world with its gods, said to him, “Come, monk!” And with that he became a monk.