Bhagavad Gita 18.6 Chapter 18, Verse 6

एतान्यपि तु कर्माणि सङ्गं त्यक्त्वा फलानि च ।
कर्तव्यानीति मे पार्थ निश्चितं मतमुत्तमम् ॥१८.६॥

etānyapi tu karmāṇi saṅgaṃ tyaktvā phalāni ca
kartavyānīti me pārtha niścitaṃ matamuttamam

Meaning

But even these actions should be done giving up attachment and the desire for results. This, O Partha, is my firm and final view.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 18.6 (Chapter 18, Liberation through Renunciation (Moksha Sannyasa Yoga), Verse 6)