4:20  

त्यक्त्वा कर्मफलासङ्गं नित्यतृप्तो निराश्रयः ।
कर्मण्यभिप्रवृत्तोऽपि नैव किंचित्करोति सः ॥४-२०॥

tyaktwaa karmaphalaasa~NgaM nityatRRipto niraashrayaH ।

karmaNyabhiprawRRitto'pi naiwa kiMchitkaroti saH ॥४-२०॥

Source: Automatic ITRANS Transliteration

Abandoning attachment to action-fruits, always content, non-refugee,
Even though engaged in actions, he does not a bit.

Abandoning attachment to the results of action, always content, self-sufficient, though he may be engaged in actions, he [actually] does not the slightest thing.

Source: Milind S. Pandit

Having abandoned attachment to the fruits of work, ever content, and dependent on no one (but God); though engaged in activity, one does nothing at all (and incurs no Karmic reaction).

Source: The Bhagavad-Gita: The Sacred Song

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.

Source: Bhagavad Gita As It Is