Bhagavad Gita 3.19
तस्मादसक्तः सततं कार्यं कर्म समाचर। असक्तो ह्याचरन्कर्म परमाप्नोति पूरुषः।।3.19।।
tasmādasaktaḥ satataṃ kāryaṃ karma samācara| asakto hyācarankarma paramāpnoti pūruṣaḥ||3.19||
tasmadasaktah satatam karyam karma samacara asakto hyacarankarma paramapnoti purushah3.19
Meaning
Therefore, always perform your duty without attachment, for by doing work without attachment, one attains the Supreme. Selfless action is itself a means to liberation.
इसलिए, तुम अनासक्त होकर सदैव कर्तव्य कर्म का सम्यक् आचरण करो; क्योंकि, अनासक्त पुरुष कर्म करता हुआ परमात्मा को प्राप्त होता है।
This is verse 19 of 43 in Chapter 3 (Karma Yoga) of the Bhagavad Gita.