Brihadaranyaka Upanishad (with commentary) · Chapter 5.12

BrhUpBh_5,11.1 etadvai paramaṃ tapaḥ /
kiṃ tat /
yadyāhito vyādhito jvarādiparigṛhītaḥ sanyattapyate tadetatparamaṃ tapa ityevaṃ cintayet /
duḥkhasāmānyāt /
tasyaivaṃ cintayato viduṣaḥ karmakṣayahetustadeva tapo bhavatyanindato 'viṣīdataḥ /
sa eva ca tena vijñānatapasā dagdhakilbaṣaḥ paramaṃ haiva lokaṃ jayati ya evaṃ veda /
tathaitadvai paramaṃ tapo yaṃ pretamagnāvabhyādadhati /
agnipraveśasāmānyāt /
paramaṃ haiva lokaṃ jayati ya evaṃ veda //1//
iti śrīmadbṛhadāraṇyakopaniṣadbhāṣye pañcamādhyāyasyaikādaśaṃ brāhmaṇam //11//
START BrhUp 5,12.1
annaṃ brahmety eka āhuḥ |
tan na tathā |
pūyati vā annam ṛte prāṇāt |
prāṇo brahmety eka āhuḥ |
tan na tathā |
śuṣyati vai praṇa ṛte 'nnāt |
ete ha tv eva devate ekadhābhūyaṃ bhūtvā paramatāṃ gacchataḥ |
tad dha smāha prātṛdaḥ pitaram |
kiṃ svid evaivaṃ viduṣe sādhu kuryāṃ kim evāsmā asādhu kuryām iti |
sa ha smāha pāṇinā mā prātṛda |
kas tv enayor ekadhābhūyaṃ bhūtvā paramatāṃ gacchatīti |
tasmā u haitad uvāca vīti |
annaṃ vai vi |
anne hīmāni sarvāṇi bhūtāni viṣṭāni |
ram iti |
prāṇo vai ram |
prāṇe hīmāni sarvāṇi bhūtāni ramante |
sarvāṇi ha vā asmin bhūtāni viśanti |
sarvāṇi bhūtāni ramante ya evaṃ veda