Bhagavad Gita · 18.23

नियतं सङ्गरहितमरागद्वेषतः कृतम्।अफलप्रेप्सुना कर्म यत्तत्सात्त्विकमुच्यते॥

niyataṁ saṅga-rahitam arāga-dveṣhataḥ kṛitam aphala-prepsunā karma yat tat sāttvikam uchyate

Action that is ordained, performed without attachment, without love or hatred, by one who desires no fruit — that action is declared to be sattvic.

— Bhagavad Gita 18.23

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)