Mundaka Upanishad Verse 2.2.10
Sanskrit Verse
न तत्र सूर्यो भाति न चन्द्रतारकं नेमा विद्युतो भान्ति कुतोऽयमग्निः ।
तमेव भान्तमनुभाति सर्वं तस्य भासा सर्वमिदं विभाति ॥ १० ॥
Transliteration
na tatra sūryo bhāti na candratārakaṃ nemā vidyuto bhānti kuto’yamagniḥ |
tameva bhāntamanubhāti sarvaṃ tasya bhāsā sarvamidaṃ vibhāti || 10 ||
Translation
The sun shines not there, nor the moon and the stars. Nor do these lightnings shine. How could this fire? All shine after him who shines. All this is illumined by his radiance.

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