Chapter 2 · verse 48 · gita.yoga.org

Bhagavad Gita 2.48

योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनञ्जय। सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते

Perform action, O Arjuna, being steadfast in Yoga, abandoning attachment and balanced in success and failure; evenness of mind is called Yoga.