Bhagavad Gita 4.21
Expecting nothing, his mind and personality controlled, without greed, doing only bodily actions; though he acts, he remains untainted.
निराशीर्यतचित्तात्मा त्यक्तसर्वपरिग्रहः।
शारीरं केवलं कर्म कुर्वन्नाप्नोति किल्बिषम्॥nirāśīryatacittātmā tyaktasarvaparigrahaḥ|
śārīraṃ kevalaṃ karma kurvannāpnoti kilbiṣam||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).