Brihadaranyaka Upanishad 2.17

स होवाचाजातशत्रुः यत्रैष एतत्सुप्तोऽभूत् य एष विज्ञानमयः पुरुषः क्वैष तदाभूत् कुत एतदागात् इति | तदु ह न मेने गार्ग्यः ॥

sa hovachaajatashatruh yatraisha etat supto'bhut ya esha vijnanamayah purushah kvaisha tadabhut kuta etad agat iti | tadu ha na mene gargyah ||

Ajatashatru said: 'When this man was thus asleep — this being who is full of consciousness — where was he then? And from where did he come back?' Gargya did not know.

अजातशत्रु ने पूछा: 'जब यह पुरुष — यह विज्ञानमय पुरुष — सो रहा था, तब वह कहाँ था? और वह यहाँ कहाँ से आया?' गार्ग्य को उत्तर नहीं सूझा।