Chāndogya Upaniṣad 4.14.2

4.14.2

bhagava iti ha pratiśuśrāva \
brahmavida iva somya mukhaṃ bhāti \
ko nu tvānuśaśāseti \
ko nu mānuśiśyād bho itīhāpeva (S ) \
ime nūnam īdṛśā anyādṛśā itīha agnīn abhyūde \
kiṃ nu somya kila te avocann iti \\414.2\

2. ‘Sir!’ he then replied.

‘Your face, my dear, shines like a Brahma-knower’s. Who, pray, has instructed you?’

‘Who, pray, would instruct me, Sir?’—Here he denied it, as it were.—‘These! They are of this appearance now, but they were of a different appearance!’—Here he alluded to the fires.—

‘What, pray, my dear, did they indeed tell you?’