Chapter 10 · verse 20 · gita.yoga.org

Bhagavad Gita 10.20

अहमात्मा गुडाकेश सर्वभूताशयस्थितः। अहमादिश्च मध्यं च भूतानामन्त एव च

I am the Self, O Gudakesa, seated in the hearts of all beings; I am the beginning, the middle, and the end of all beings.