Brihadaranyaka Upanishad 5.12.1

5.12.1

annaṃ brahmetyeka āhustanna tathā pūyati vā annamṛte prāṇātprāṇo brahmetyeka āhustanna tathā śuṣyati vai prāṇa te'nnādete ha tveva devate ekadhābhūyaṃ bhūtvā paramatāṃ gacchatastaddha smāha prātṛdaḥ pitaraṃ kim̐svidevaivaṃ viduṣe sādhu kuryāṃ kimevāsmā asādhu kuryāmiti sa ha smāha pāṇinā mā prātṛda kastvenayorekadhā bhūyaṃ bhūtvā paramatāṃ gacchatīti tasmā u haitaduvāca vītyannaṃ vai vyanne hīmāni sarvāṇi bhūtāni viṣṭāni ramiti prāṇo vai raṃ prāṇe hīmāni sarvāṇi bhūtāni ramante sarvāṇi ha vā asminbhūtāni viśanti sarvāṇi bhūtāni ramante ya evaṃ veda

Some say that food is Brahman. It is not so, for food rots without the vital force. Others say that the vital force is Brahman. It is not so, for the vital force dries up without food. But these two deities being united attain their highest. So Prâtṛda said to his father, 'What good indeed can I do to one who knows like this, and what evil indeed can I do to him either?' The father, with a gesture of the hand, said, 'Oh, no, Prâtṛda, for who would attain his highest by being identified with them?' Then he said to him

5.12.1.p1

iti pañcamādhyāye dvādaśaṃ brāhmaṇam