Kauṣītaki Upaniṣad 2.13.3

2.13.3

praveśānantaraṃ cakṣurindriyaṃ praviṣṭaṃ tataścāvalokanaṃ vadanañcābhūt | anantaraṃ śrotreendriyaṃ praviṣṭaṃ tataśca śravaṇāvalokanavadanānyabhūvan | anantaraṃ manaḥ praviṣṭaṃ tataśca dhyānaśravaṇāvalokanavadānyānyāsan na tu śarīramutthitavadityetatparyāyatrayeṇāha, athainaccakṣuḥ praviveśa tadvācā vadaccakṣuṣā paśyacchiṣya eva, athainat śrotraṃ praviveśa tadvācā vadaccakṣuṣā paśyacchrotreṇa śṛṇvacchiṣya eva, athainat manaḥ praviveśa tadvācā vadaccakṣuṣā paśyacchrotreṇa śṛṇvanmanasā dhyāyacchiṣya eva spaṣṭaṃ, atha vākcakṣuḥśrotramanaḥpraveśānantarametaccharīraṃ vadat paśyat śṛṇvat dhyāyat prāṇe mukhavidvāntarvartī pañcavṛttirvāyuviśeṣaḥ praviveśa praveśaṃ kṛtavān, taccharīraṃ tata eva tasmātprāṇapraveśādeva na tvanyasmātsamuttasthau samyagutthānaṃ kṛtavat, te ca vāgādayaḥ parityaktābhimānāḥ devāḥ devaśabdābhidheyāḥ prāṇe śarīrotthāpanahetau prakṛṣṭaceṣṭāvati niḥśreyasaṃ sarvebhyo vāgādibhya utkarṣaṃ