Chāndogya Upaniṣad 6.5

6.5.1

annam aśitaṃ tredhā vidhīyate \
tasya yaḥ sthaviṣṭho dhātus tat purīṣaṃ bhavati \
yo madhyamas tan māṃsam \
yo 'ṇiṣṭhas tan manaḥ \\605.1\

1. Food, when eaten, becomes divided into three parts. That which is its coarsest constituent, becomes the feces; that which is medium, the flesh; that which is finest, the mind.

6.5.2

āpaḥ pītās tredhā vidhīyante \
tāsāṃ yaḥ sthaviṣṭho dhātus tan mūtraṃ bhavati \
yo madhyamas tal lohitam \
yo 'ṇiṣṭhaḥ sa prāṇaḥ \\605.2\

2. Water, when drunk, becomes divided into three parts. That which is its coarsest constituent, becomes the urine; that which is medium, the blood; that which is finest, the breath (prāṇa).

6.5.3

tejo 'śitaṃ tredhā vidhīyate \
tasya yaḥ sthaviṣṭho dhātus tad asthi bhavati \
yo madhyamaḥ sa majjā \
yo 'ṇiṣṭhaḥ sā vāk \\605.3\

3. Heat, when eaten, becomes divided into three parts. That which is its coarsest constituent, becomes bone; that which is medium, the marrow; that which is finest, the voice.

6.5.4

annamayaṃ hi (S ) manaḥ \
āpomayaḥ prāṇaḥ \
tejomayī vāg iti \
bhūya eva mā bhagavān vijñāpayatv iti \
tathā (S ) hovāca \\605.4\

4. For, my dear, the mind consists of food; the breath consists of water; the voice consists of heat.’

‘Do you, Sir, cause me to understand even more.’

‘So be it, my dear,’ said he.