Chapter 3 · verse 15 · gita.yoga.org

Bhagavad Gita 3.15

कर्म ब्रह्मोद्भवं विद्धि ब्रह्माक्षरसमुद्भवम्। तस्मात्सर्वगतं ब्रह्म नित्यं यज्ञे प्रतिष्ठितम्

Know that action comes from Brahma, and Brahma comes from the Imperishable. Therefore, the all-pervasive Brahma ever rests in sacrifice.