Passage
Taittiriya Upanisad TaittU_2,4.1
san taittiriya
yato vāco nivartante aprāpya manasā saha / ānandaṃ brahmaṇo vidvān na bibheti kadācaneti / tasyaiṣa eva śārīra ātmā yaḥ pūrvasya / tasmādvā etasmānmanomayād anyo 'ntara ātmā vijñānamayaḥ / tenaiṣa pūrṇaḥ / sa vā eṣa puruṣavidha eva / tasya puruṣavidhatām anvayaṃ puruṣavidhaḥ / tasya śraddhaiva śiraḥ / ṛtaṃ dakṣiṇaḥ pakṣaḥ / satyamuttaraḥ pakṣaḥ / yoga ātmā / mahaḥ pucchaṃ pratiṣṭhā / tadapyeṣa śloko bhavati