Bhagavad Gita 18.9

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

kāryamityeva yatkarma niyataṃ kriyate'rjuna |saṅgaṃ tyaktvā phalaṃ caiva sa tyāgaḥ sāttviko mataḥ ||

Whatever obligatory action is done, O Arjuna, merely because it ought to be done, abandoning attachment and also the desire for reward, that renunciation is regarded as sattvic (pure).

He who performs an obligatory action, believing it to be a duty that ought to be done, without any personal desire to do the act or to receive any return—such renunciation is pure.

Our plain-language meaning of this verse is waiting for scholar review.