Bhagavad Gita 18.47

श्रेयान्स्वधर्मो विगुणः परधर्मात्स्वनुष्ठितात्।स्वभावनियतं कर्म कुर्वन्नाप्नोति किल्बिषम्॥

śreyānsvadharmo viguṇaḥ paradharmātsvanuṣṭhitāt |svabhāvaniyataṃ karma kurvannāpnoti kilbiṣam ||

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.

It is better to do one's own duty, however defective it may be, than to follow the duty of another, however well one may perform it. He who does his duty as his own nature reveals it, never commits a sin.

Our plain-language meaning of this verse is waiting for scholar review.