CHĀNDOGYA UPANISHAD · 8.6.2

तद् यथा महापथ आतत उभौ ग्रामौ गच्छतीमं चामुं चैवम् एवैता आदित्यस्य रश्मय उभौ लोकौ गच्छन्तीमं चामुं च ।
अमुष्माद् आदित्यात् प्रतायन्ते ता आसु नाडीषु सृप्ताः ।
आभ्यो नाडीभ्यः प्रतायन्ते ते ऽमुष्मिन्न् आदित्ये सृप्ताः ॥

tad yathā mahāpatha ātata ubhau grāmau gacchatīmaṃ cāmuṃ caivam evaitā ādityasya raśmaya ubhau lokau gacchantīmaṃ cāmuṃ ca ।
amuṣmād ādityāt pratāyante tā āsu nāḍīṣu sṛptāḥ ।
ābhyo nāḍībhyaḥ pratāyante te ’muṣminn āditye sṛptāḥ ॥

As a very long highway goes to two places, to one at the beginning, and to another at the end, so do the rays of the sun go to both worlds, to this one and to the other. They start from the sun, and enter into those arteries; they start from those arteries, and enter into the sun.

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