Bhagwad Gita
Chapter 5, Verse 11
कायेन मनसा बुद्ध्या केवलैरिन्द्रियैरपि।
योगिनः कर्म कुर्वन्ति सङ्गं त्यक्त्वाऽऽत्मशुद्धये।।5.11।।
The yogis, abandoning attachment, act with body, mind, intelligence, and even with the senses, only for the purpose of purification.