CHĀNDOGYA UPANISHAD · 4.1.2

अथ ह हंसा निशायाम् अतिपेतुः ।
तद् धैवं हंसो हंसम् अभ्युवाद ।
हो हो ऽयि भल्लाक्ष भल्लाक्ष जानश्रुतेः पौत्रायणस्य समं दिवा ज्योतिर् आततं तन् मा प्रसाङ्क्षीस् तत् त्वां मा प्रधाक्षीर् इति ॥

atha ha haṃsā niśāyām atipetuḥ ।
tad dhaivaṃ haṃso haṃsam abhyuvāda ।
ho ho ’yi bhallākṣa bhallākṣa jānaśruteḥ pautrāyaṇasya samaṃ divā jyotir ātataṃ tan mā prasāṅkṣīs tat tvāṃ mā pradhākṣīr iti ॥

Once in the night some Hamsas (flamingoes) flew over his house, and one flamingo said to another: 'Hey, Bhallâksha, Bhallâksha (short-sighted friend). The light (glory) of Gânasruti Pautrâyana has spread like the sky. Do not go near, that it may not burn thee.'

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)