Shloka 13
Ācāra-vidhi (Rules of Conduct) — Yudhiṣṭhira’s Inquiry and Bhīṣma’s Normative Catalogue
अग्निवेगवह:ः प्राणो गुदान्ते प्रतिहन्यते । स ऊर्ध्वमागम्य पुन: समुत्क्षिपति पावकम्
agnivegavahaḥ prāṇo gudānte pratihanyate | sa ūrdhvam āgamya punaḥ samutkṣipati pāvakam |
婆罗堕阇阐释道：普拉那（prāṇa）挟火之势而行，至直肠末端附近受阻；随即上返，又将近旁的内火托举而上，使之更为炽盛。
भरद्वाज उवाच
Educational Q&A
The verse teaches that bodily life is governed by regulated movements of prāṇa and agni; understanding these inner dynamics supports restraint, balance, and disciplined conduct rather than impulsive living.
Bharadvāja describes prāṇa moving with fiery force, being checked near the anal region, then rebounding upward and thereby raising/activating the nearby inner fire (pāvaka), as part of an explanation of internal bodily processes.