18:6  

एतान्यपि तु कर्माणि सङ्गं त्यक्त्वा फलानि च ।
कर्तव्यानीति मे पार्थ निश्चितं मतमुत्तमम् ॥१८- ६॥

Transliteration

etaanyapi tu karmaaNi sa~NgaM tyaktwaa phalaani cha ।

kartawyaaniiti me paartha nishchitaM matamuttamam ॥१८- ६॥

Translation

And even these actions, relinquishing results
Should be done. This, O Partha, is my best certain opinion.

Translation

Even these (obligatory) works should be performed without attachment to the fruits. This is My definite supreme advice, O Arjuna.

Translation

All these activities should be performed without any expectation of result. They should be performed as a matter of duty, O son of Prtha. That is My final opinion.