Bhagavad Gita 4.20

त्यक्त्वा कर्मफलसङ्गं नित्यतृप्तो निराश्रय: |
कर्मण्यभिप्रवृत्तोऽपि नैव किञ्चित्करोति स:

Translation

Such people, having given up attachment to the fruits of their actions, are always satisfied and not dependent on external things. Despite engaging in activities, they do not do anything at all.