B.G 2.31

स्वधर्ममपि चावेक्ष्य न विकम्पितुमर्हसि। धर्म्याद्धि युद्धाच्छ्रेयोऽन्यत्क्षत्रियस्य न विद्यते ॥२-३१॥

svadharmam api cāvekṣya na vikampitum arhasi। dharmyāddhi yuddhācchreyo'nyatkṣatriyasya na vidyate ॥2-31॥

[स्वधर्मम् (svadharmam) - one's own duty; अपि (api) - also; च (ca) - and; अवेक्ष्य (avekṣya) - considering; न (na) - not; विकम्पितुम् (vikampitum) - to waver; अर्हसि (arhasi) - you should; धर्म्यात् (dharmyāt) - than a righteous; हि (hi) - indeed; युद्धात् (yuddhāt) - war; श्रेयः (śreyaḥ) - better; अन्यत् (anyat) - other; क्षत्रियस्य (kṣatriyasya) - for a Kshatriya; न (na) - not; विद्यते (vidyate) - exists;]

(Considering your own duty as a warrior, you should not hesitate, for there is no greater good for a Kshatriya than to engage in a righteous battle.)

You must attend to your swa-dharma, your own duty, without vacillating. The righteous war is only beneficial for a warrior like you and other concerns are not suitable.