Bhagavad Gita 8.3
श्रीभगवानुवाच | अक्षरं ब्रह्म परमं स्वभावोऽध्यात्ममुच्यते | भूतभावोद्भवकरो विसर्गः कर्मसंज्ञितः ||८-३||
śrībhagavānuvāca . akṣaraṃ brahma paramaṃ svabhāvo.adhyātmamucyate . bhūtabhāvodbhavakaro visargaḥ karmasaṃjñitaḥ ||8-3||

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Recitation
8.3 The Blessed Lord said Brahman is the Imperishable, the Supreme; Its essential nature is called Self-knowledge; the offering (to the gods) which causes existence and manifestation of beings and which also sustains them is called action.
The Supreme Personality of Godhead said: The indestructible, transcendental living entity is called Brahman, and his eternal nature is called adhyātma, the self. Action pertaining to the development of the material bodies of the living entities is called karma, or fruitive activities.
