[517] "And what, bhikkhus, is the undertaking of things (dhammasamādāna) that is painful in the present and ripens in suffering (dukkha) in the future? Here, bhikkhus, a certain one is a naked ascetic, flouting conventions, licking his hands, not coming when asked to come, not standing still when asked to stand still; he does not consent to food brought to him, nor to food prepared specifically for him, nor to an invitation. He does not receive from the mouth of a pot, he does not receive from the mouth of a basket, nor across a threshold, nor across a pestle, nor across a stick, nor from two people eating together, nor from a pregnant woman, nor from a woman giving suck, nor from a woman gone in among men, nor from where food has been advertised for collection, nor from where a dog is standing by, nor from where flies are swarming in swarms; he accepts no fish, no meat; he drinks no liquor, no wine, no fermented gruel. He keeps to one house, to one morsel; or he keeps to two houses, to two morsels … or he keeps to seven houses, to seven morsels. He subsists on one small offering, he subsists on two small offerings … he subsists on seven small offerings. He takes food once a day, he takes food once in two days … he takes food once in seven days — thus he dwells devoted to the practice of taking food at stated intervals, even such as up to half a month. He is an eater of greens, or an eater of millet, or an eater of wild rice, or an eater of daddula rice-scraps, or an eater of haṭa water-plants, or an eater of rice bran, or an eater of rice scum, or an eater of sesame flour, or an eater of grass, or an eater of cow dung; he subsists on forest roots and fruits, feeding on fallen fruits. He wears hemp cloth, he wears mixed-hemp cloth, he wears shrouds of corpses, he wears rag-robes, he wears garments of tirīṭa bark, he wears antelope hides, he wears strips of antelope hide, he wears a garment of kusa grass, he wears a garment of wood shavings, he wears a blanket of human hair, he wears owls' wings. He is one who plucks out hair and beard, devoted to the practice of plucking out hair and beard; he is one who stands continuously, rejecting seats; he is one who squats, devoted to the exertion of squatting; he is one who lies on thorns, making his bed upon a bed of thorns; he dwells devoted to the practice of descending into the water three times daily, with evening as the third time — thus he dwells devoted to the practice of tormenting and mortifying the body in many such various ways. On the breaking up of the body, after death, he reappears in a state of deprivation, a bad destination, a place of ruin, in hell (niraya). This, bhikkhus, is called the undertaking of things that is painful in the present and ripens in suffering in the future."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.