Bhagavad Gita 18.47 Chapter 18, Verse 47

श्रेयान्स्वधर्मो विगुणः परधर्मात्स्वनुष्ठितात् ।
स्वभावनियतं कर्म कुर्वन्नाप्नोति किल्बिषम् ॥१८.४७॥

śreyānsvadharmo viguṇaḥ paradharmātsvanuṣṭhitāt
svabhāvaniyataṃ karma kurvannāpnoti kilbiṣam

Meaning

Better is one's own dharma, though imperfect, than another's dharma well performed. Doing the work determined by one's own nature, one incurs no sin.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 18.47 (Chapter 18, Liberation through Renunciation (Moksha Sannyasa Yoga), Verse 47)