Chapter 18 · verse 47 · gita.yoga.org

Bhagavad Gita 18.47

श्रेयान्स्वधर्मो विगुणः परधर्मात्स्वनुष्ठितात्।स्वभावनियतं कर्म कुर्वन्नाप्नोति किल्बिषम्

Better is one's own duty, even if it is destitute of merits, than the duty of another well performed. He who does the duty ordained by his own nature incurs no sin.