Bhagwad Gita
Chapter 8, Verse 4
अधिभूतं क्षरो भावः पुरुषश्चाधिदैवतम्।
अधियज्ञोऽहमेवात्र देहे देहभृतां वर।।8.4।।
Physical nature is known to be endlessly mutable. The universe is the cosmic form of the Supreme Lord, and I am that Lord represented as the Supersoul, dwelling in the heart of every embodied being.