Bhagavad Gita 3.19 Chapter 3, Verse 19

तस्मादसक्तः सततं कार्यं कर्म समाचर ।
असक्तो ह्याचरन्कर्म परमाप्नोति पूरुषः ॥३.१९॥

tasmādasaktaḥ satataṃ kāryaṃ karma samācara
asakto hyācarankarma paramāpnoti pūruṣaḥ

Meaning

Therefore, always perform the work that has to be done, without attachment; by working without attachment a person attains the Supreme.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 3.19 (Chapter 3, The Yoga of Action (Karma Yoga), Verse 19)