Bhagavad Gita Chapter 3 Verse 35
भगवद् गीता अध्याय 3 श्लोक 35

श्रेयान्स्वधर्मो विगुणः परधर्मात्स्वनुष्ठितात्।
स्वधर्मे निधनं श्रेयः परधर्मो भयावहः।।3.35।।



हिंदी अनुवाद - स्वामी तेजोमयानंद
।।3.35।। सम्यक् प्रकार से अनुष्ठित परधर्म की अपेक्षा गुणरहित स्वधर्म का पालन श्रेयष्कर है स्वधर्म में मरण कल्याणकारक है (किन्तु) परधर्म भय को देने वाला है।।


Brahma Vaishnava Sampradaya - Commentary





In this verse Lord Krishna is emphasising the fact that one  should  perform
the duties one is authorised to do according to ones station  and  rank  in
society. Arjuna was a royal prince educated and trained by the  strength  of
his might to uphold and protect dharma or  righteousness  and  although  war
enacts terrible suffering it was necessary and was  appropriate  for  Arjuna
to engage in it.