Bhagavad-gītā 2.48
BG 2.48
Open the full passageयोगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनञ्जय । सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते ॥४८॥
Sanskrit
yoga-sthaḥ kuru karmāṇi saṅgaṁ tyaktvā dhanañjaya siddhy-asiddhyoḥ samo bhūtvā samatvaṁ yoga ucyate
Translation
Perform your duty equipoised, O Arjuna, abandoning all attachment to success or failure. Such equanimity is called yoga.