Bhagavad Gita 8.3

भगवान श्रीउवाच |
अक्षरं ब्रह्म परमं स्वभावोऽध्यात्ममुच्यते |
भूतभावोद्भवकरो विसर्ग: कर्मसंज्ञित:

Translation

The Lord said: The Supreme Indestructible Entity is called Brahman; one’s own self is called adhyatma. Actions pertaining to the material personality of living beings, and its development are called karma, or fruitive activities.