Brihadaranyaka Upanishad 3.80

विदग्ध उवाच | याज्ञवल्क्य य एवायं विज्ञानमयः पुरुषो यो अयमस्मिन्पुरुषे तिष्ठन् | कतमः स याज्ञवल्क्येति ॥

vidagdha uvacha | yajnavalkya ya evayam vijnanamayah purusho yo ayam asmin purushe tishthan | katamah sa yajnavalkyeti ||

Vidagdha said: 'Yajnavalkya, which is that person who is of the nature of knowledge and who dwells in this body? Tell me, Yajnavalkya.'

विदग्ध ने कहा — 'याज्ञवल्क्य! जो यह विज्ञानमय पुरुष इस शरीर में रह रहा है — वह कौन है, याज्ञवल्क्य?'