BṚHADĀRAṆYAKA UPANISHAD · 2.1.16

स होवाचाजातशत्रुः -- यत्रैष एतत् सुप्तो ऽभूद् य एष विज्ञानमयः पुरुषः क्वैष तदाभूत् कुत एतद् आगाद् इति ।
तद् उ ह न मेने गार्ग्यः ॥

sa hovācājātaśatruḥ -- yatraiṣa etat supto ’bhūd ya eṣa vijñānamayaḥ puruṣaḥ kvaiṣa tadābhūt kuta etad āgād iti ।
tad u ha na mene gārgyaḥ ॥

Agâtasatru said: 'When this man was thus asleep, where was then the person (purusha), the intelligent? and from whence did he thus come back?' Gârgya did not know this?

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)