CHĀNDOGYA UPANISHAD · 3.5.3

तद् व्यक्षरत् ।
तद् आदित्यम् अभितो ऽश्रयत् ।
तद् वा एतद् यद् एतद् आदित्यस्य मध्ये क्षोभत इव ॥

tad vyakṣarat ।
tad ādityam abhito ’śrayat ।
tad vā etad yad etad ādityasya madhye kṣobhata iva ॥

That flowed forth, and went towards the sun. And that forms what seems to stir in the centre of the sun.

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