Bhagavad Gita · 3.35

श्रेयान्स्वधर्मो विगुणः परधर्मात्स्वनुष्ठितात्।स्वधर्मे निधनं श्रेयः परधर्मो भयावहः॥

śhreyān sva-dharmo viguṇaḥ para-dharmāt sv-anuṣhṭhitāt sva-dharme nidhanaṁ śhreyaḥ para-dharmo bhayāvahaḥ

It is far better to perform one's own duty, even imperfectly, than to perform another's duty perfectly. It is better to die engaged in one's own dharma, for another's path is fraught with danger.

— Bhagavad Gita 3.35

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)