Narada Purana — Purva Bhaga, Shloka 108
Sṛṣṭi-pralaya-kathana: Mahābhūta-guṇāḥ, Vṛkṣa-indriya-vādaḥ, Prāṇa-vāyu-vyavasthā
प्राणानां सन्निपाताश्च सन्निपातः प्रजायते । ऊष्मा चाग्निरिति ज्ञेयो योऽन्नं पचति देहिनाम् ॥ १०८ ॥
prāṇānāṃ sannipātāśca sannipātaḥ prajāyate | ūṣmā cāgniriti jñeyo yo'nnaṃ pacati dehinām || 108 ||
由诸生命之气（prāṇa）的汇合而生其合一的聚集；那热应当了知为身中之火（agni），即能消化一切有身众生之食的内火。
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It links bodily physiology to inner discipline: the coordinated functioning of prāṇa generates the inner fire (agni) that sustains the body, reminding the seeker that spiritual practice also depends on regulated life-force and purity.
While primarily a mokṣa-dharma teaching, it supports bhakti indirectly by emphasizing bodily steadiness—proper digestion and balanced prāṇa help maintain sāttvika conduct, enabling consistent japa, worship, and remembrance of the Lord.
It reflects applied śāstra on the body—close to Yoga and Āyurveda-style reasoning—showing how prāṇa and agni govern digestion, a practical takeaway for diet-regulation and purity in ritual and meditation.