Bhagwad Gita
Chapter 4, Verse 20
त्यक्त्वा कर्मफलासङ्गं नित्यतृप्तो निराश्रयः।
कर्मण्यभिप्रवृत्तोऽपि नैव किञ्चित्करोति सः।।4.20।।
Abandoning all attachment to the results of his activities, ever satisfied and independent, he performs no fruitive action, although engaged in all kinds of undertakings.