Kauṣītaki Upaniṣad 2.5

2.5.1

athātaḥ saṃyamanaṃ prātardanam āntaram agnihotram iti cācakṣate /

5 (4). Now next, the matter of self-restraint (_saṃyamana_) according to Pratardana, or the 'Inner Agnihotra Sacrifice,' as they call it.—

2.5.2

yāvad vai puruṣo bhāṣate na tāvat prāṇituṃ śaknoti /

As long, verily, as a person is speaking, he is not able to breathe. Then he is sacrificing breath (_prāṇa_) in speech.

2.5.3

prāṇaṃ tadā vāci juhoti /

2.5.4

yāvad vai puruṣaḥ prāṇiti na tāvad bhāṣituṃ śaknoti /

As long, verily, as a person is breathing, he is not able to speak. Then he is sacrificing speech (_vāc_) in breath.

2.5.5

vācaṃ tadā prāṇe juhoti /

2.5.6

ete anante amṛte āhutī jāgrac ca svapaṃś ca santataṃ [avyavacchinnaṃ] juhoti /

These two are unending, immortal oblations; whether waking or sleeping, one is sacrificing continuously, uninterruptedly. Now, whatever other oblations there are, they are limited, for they consist of works (_karma-maya_). Knowing this very thing, verily, indeed, the ancients did not sacrifice the Agnihotra sacrifice.

2.5.7

atha yā anyā āhutayo 'ntavatyas tāḥ karmamayyo hi bhavanti /

2.5.8

etad dha vai pūrve vidvāṃso 'gnihotraṃ na juhavāñ cakruḥ //5//