Chapter 3 · The Yoga of Action · Krishna said
Bhagavad Gita 3.9 — Work as an offering
यज्ञार्थात्कर्मणोऽन्यत्र लोकोऽयं कर्मबन्धनः। तदर्थं कर्म कौन्तेय मुक्तसङ्गः समाचर ॥
yajñārthātkarmaṇo'nyatra loko'yaṃ karmabandhanaḥ | tadarthaṃ karma kaunteya muktasaṅgaḥ samācara ||
Meaning
Except for work done as an offering (yajna), all work in this world binds a person. So, Arjuna, do your work as an offering, free from attachment.