Bhagavad Gita 2.31 Chapter 2, Verse 31

स्वधर्ममपि चावेक्ष्य न विकम्पितुमर्हसि ।
धर्म्याद्धि युद्धाच्छ्रेयोऽन्यत्क्षत्रियस्य न विद्यते ॥२.३१॥

svadharmamapi cāvekṣya na vikampitumarhasi
dharmyāddhi yuddhācchreyo'nyatkṣatriyasya na vidyate

Meaning

Considering your own duty as a warrior, you should not waver, for there is nothing better for a kshatriya than a righteous battle.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 2.31 (Chapter 2, The Yoga of Knowledge (Sankhya Yoga), Verse 31)