18:9  

कार्यमित्येव यत्कर्म नियतं क्रियतेऽर्जुन ।
सङ्गं त्यक्त्वा फलं चैव स त्यागः सात्त्विको मतः ॥१८- ९॥

Transliteration

kaaryamityewa yatkarma niyataM kriyate'rjuna ।

sa~NgaM tyaktwaa phalaM chaiwa sa tyaagaH saattwiko mataH ॥१८- ९॥

Translation

Those actions done because they should be done, O Arjuna,
and relinquishing attachment to the results, that relinquishment is sattvic in [my] opinion.

Translation

Obligatory work performed as duty, renouncing attachment to the fruit, is alone regarded as Saattvika Tyaaga, O Arjuna.

Translation

But he who performs his prescribed duty only because it ought to be done, and renounces all attachment to the fruit--his renunciation is of the nature of goodness, O Arjuna.