Kammavipākajasutta
Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā sāvatthiyaṁ viharati jetavane anāthapiṇḍikassa ārāme. Tena kho pana samayena aññataro bhikkhu bhagavato avidūre nisinno hoti pallaṅkaṁ ābhujitvā ujuṁ kāyaṁ paṇidhāya purāṇakammavipākajaṁ dukkhaṁ tibbaṁ kharaṁ kaṭukaṁ vedanaṁ adhivāsento sato sampajāno avihaññamāno.
Born of the Fruits of Deeds
So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. Now, at that time a certain mendicant was sitting not far from the Buddha, cross-legged, with his body straight. As a result of past deeds, he suffered painful, sharp, severe, and acute feelings, which he endured unbothered, with mindfulness and awareness.