Bhagavad Gita · 15.12

यदादित्यगतं तेजो जगद्भासयतेऽखिलम्।यच्चन्द्रमसि यच्चाग्नौ तत्तेजो विद्धि मामकम्॥

yad āditya-gataṁ tejo jagad bhāsayate 'khilam yach chandramasi yach chāgnau tat tejo viddhi māmakam

The radiance in the sun that illumines the entire world, and that which is in the moon and in fire — know that radiance to be mine.

— Bhagavad Gita 15.12

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)