Visavanta Jātaka

Jataka No. 69 of the Pali Canon was told by the Buddha concerning a vow undertaken by Sariputta, one of the Buddha's two chief disciples. When monks at a monastery shared meal cakes, leftovers were customarily set aside for colleagues who were absent at the time. A younger monk arrived late one day to find that Sariputta had already eaten his reserved portion. His evident disappointment moved Sariputta to vow that he would never again touch meal cakes for the rest of his life. The Buddha declared that Sariputta would never return to something he had once renounced, and recalled a former life in which the very same unbending resolve had once been tested against the threat of death itself.

In ancient Varanasi, when King Brahmadatta held sway, the Bodhisatta was a physician of incomparable renown. He possessed mastery over all antidotes, surgical methods, and the secret remedies for snake venom that lesser healers could never hope to match.

One morning, a villager cutting brush in the thickets was struck by a deadly black viper, and collapsed into convulsions soon after. His weeping kinfolk carried him straight to the Bodhisatta's dwelling, desperate for any remedy that might still save him before the poison finished its work.

The master physician examined the wound and perceived that the venom had nearly reached the heart. He told the gathered crowd that there were two surefire ways to heal such a strike. He could administer his own herbal compounds, or they could summon the very serpent responsible for the bite and compel it to draw the venom back out of the wound itself. The desperate relatives urgently begged him to summon the serpent.

By the power of his mantras, the Bodhisatta summoned the serpent, which slithered reluctantly into the courtyard. It was clearly aware of exactly why it had been called and unwilling to cooperate with whatever was about to be demanded of it.

The physician had a deep pit dug and filled with blazing acacia charcoal. He then challenged the viper directly: suck the venom back out of the man's flesh, or plunge its own body into the pit of fiery coals rather than refuse.

The serpent looked steadfastly into the roaring flames and answered that never once had any creature of its lineage drawn back into its own belly the venom it had already cast forth. It declared that turning to ashes in the furnace would be a better fate than living on in disgrace, having swallowed back its own discharge after choosing to release it.

With fearless resolve, the snake advanced toward the coals, prepared to make good on its words rather than simply speak them for effect. It showed no hesitation at all as the heat of the pit grew closer with every step it took.

Struck with awe by the reptile's unbending integrity, the Bodhisatta intervened and pulled the serpent back from the brink before it could enter the flames. He was no longer willing to let an act of principle end in needless death.

The physician then administered his antidote, entirely curing the villager of the poison that had nearly killed him, and granted the serpent its freedom with an exhortation never to harm another living being again.

At the story's end, the Buddha identified the unbending serpent with Sariputta. The same refusal to reclaim something once deliberately given up, the very quality that had once led a snake to prefer fire over disgrace, was the identical resolve Sariputta had shown centuries later over nothing more dramatic than a simple vow about meal cakes.

What this story preserved was never a lesson about snakebite alone. It was a demonstration of how completely a single principle, once truly adopted, can govern a creature's choices even when the cost of holding to it looks wildly disproportionate to anyone watching from outside. A vow over meal cakes may seem a small thing beside a serpent's choice between venom and fire. But the Buddha wanted his listeners to see that the size of the renunciation was never really the point; what mattered was the same unbroken refusal to take back what had already, deliberately, been let go.