BṚHADĀRAṆYAKA UPANISHAD · 3.9.27

अथ होवाच -- ब्राह्मणा भगवन्तो यो वः कामयते स मा पृच्छतु ।
सर्वे वा मा पृच्छत ।
यो वः कामयते तं वः पृच्छामि सर्वान् वा वः पृच्छामीति ।
ते ह ब्राह्मणा न दधृषुः ॥

atha hovāca -- brāhmaṇā bhagavanto yo vaḥ kāmayate sa mā pṛcchatu ।
sarve vā mā pṛcchata ।
yo vaḥ kāmayate taṃ vaḥ pṛcchāmi sarvān vā vaḥ pṛcchāmīti ।
te ha brāhmaṇā na dadhṛṣuḥ ॥

Then Yâgñavalkya said: 'Reverend Brâhmanas, whosoever among you desires to do so, may now question me. Or question me, all of you. Or whosoever among you desires it, I shall question him, or I shall question all of you. But those Brâhmanas durst not (say anything).

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