Bhagavad Gita Chapter 4.20
tyaktvā karma-phalāsańgaḿ
nitya-tṛpto nirāśrayaḥ
karmaṇy abhipravṛtto ’pi
naiva kiñcit karoti saḥ
Translation
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.