Ācāra-vidhi (Rules of Conduct) — Yudhiṣṭhira’s Inquiry and Bhīṣma’s Normative Catalogue
अग्निवेगवह:ः प्राणो गुदान्ते प्रतिहन्यते । स ऊर्ध्वमागम्य पुन: समुत्क्षिपति पावकम्,अग्निके वेगसे बहता हुआ प्राण गुदाके निकट जाकर प्रतिहत हो जाता है; फिर ऊपरकी ओर लौटकर समीपवर्ती अग्निको भी ऊपर उठा देता है
agnivegavahaḥ prāṇo gudānte pratihanyate | sa ūrdhvam āgamya punaḥ samutkṣipati pāvakam |
Bharadvāja explains: the vital breath, driven with the force of fire, strikes an obstruction near the end of the rectum. Rebounding upward, it then lifts and kindles the nearby inner fire.
भरद्वाज उवाच