Bhagavad Gita 2.48

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

yogasthah kuru karmani sangam tyaktva dhananjaya
siddhy-asiddhyoh samo bhutva samatvam yoga uchyate

Translation

Perform your duty established in yoga, O Arjuna, abandoning attachment, and remaining even-minded in success and failure. Such evenness of mind is called yoga.

Hindi

हे धनंजय, आसक्ति त्यागकर तथा सिद्धि और असिद्धि में समान रहकर, योग में स्थित होकर कर्म करो। यही समत्व योग कहलाता है।

Commentary

Here Krishna names yoga itself: evenness of mind, samatva. To act while remaining balanced in gain and loss is the discipline that frees action from anxiety.