स्वधर्ममपि चावेक्ष्य न विकम्पितुमर्हसि। धर्म्याद्धि युद्धाछ्रेयोऽन्यत्क्षत्रियस्य न विद्यते ॥

swa-dharmam api chāvekṣhya na vikampitum arhasi dharmyāddhi yuddhāch chhreyo ’nyat kṣhatriyasya na vidyate

Further, looking to thine own duty thou shouldst not tremble; for there is nothing more welcome to a Kshattriya than righteous war.

In plain words: Krishna tells Arjuna that, thinking of his own duty as a Kshattriya (a warrior whose role is to protect), he should not be afraid. For a warrior, nothing is better than a fight for what is right.