Bhagwad Gita
Chapter 18, Verse 23
नियतं सङ्गरहितमरागद्वेषतः कृतम्।अफलप्रेप्सुना कर्म यत्तत्सात्त्विकमुच्यते।।18.23।।
As for actions, that action in accordance with duty, which is performed without attachment, without love or hate, by one who has renounced fruitive results, is called action in the mode of goodness.