[604] At that time the Buddha, the Blessed One, was dwelling among the Bhaggas at Susumāragira, in the Bhesakaḷā Grove, the Deer Park. Now at that time, in a month of the winter season, bhikkhus (bhikkhu), having kindled a fire at a certain large hollow piece of wood, warmed themselves. And in that hollow a black snake, scorched by the fire, came out and chased the bhikkhus. The bhikkhus ran here and there. Those bhikkhus who were of few wishes … criticized, complained, and spread it about, saying: "How indeed can bhikkhus kindle a fire and warm themselves?" …
"Is it true, as they say, bhikkhus, that bhikkhus kindle a fire and warm themselves?"
"It is true, Blessed One."
The Buddha, the Blessed One, rebuked them: "How indeed, bhikkhus, can those foolish men (moghapurisa) kindle a fire and warm themselves? This, bhikkhus, is not conducive to the confidence of those without confidence, nor to the increase of those already confident …. And thus, bhikkhus, you should recite this training rule (sikkhāpada):
'Whatever bhikkhu, seeking to warm himself, should kindle a fire or cause one to be kindled, incurs a pācittiya.'"
And thus this training rule was laid down by the Blessed One for the bhikkhus.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.