BG 2.31

2.31 स्वधर्मम् own duty? अपि also? च and? अवेक्ष्य looking at? न not? विकम्पितुम् to waver? अर्हसि (thou) oughtest? धर्म्यात् than righteous? हि indeed? युद्धात् than war? श्रेयः higher? अन्यत् other? क्षत्रियस्य of a Kshatriya? न not? विद्यते is.Commentary Lord Krishna now gives to Arjuna wordly reasons for fighting. Up to this time? He talked to Arjuna on the immortality of the Self and gave him philosophical reasons. Now He says to Arjuna? O Arjuna Fighting is a Kshatriyas own duty. You ought not to swerve from that duty. To a Kshatriyta (one born in the warrior or ruling class) nothing is more welcome than a righteous war. A warrior should fight.

— vedicscriptures · exposition · source ↗

Out of the four orders of social administration, the second order, for the matter of good administration, is called kṣatriya. Kṣat means hurt. One who gives protection from harm is called kṣatriya ( trāyate – to give protection). The kṣatriyas are trained for killing in the forest. A kṣatriya would go into the forest and challenge a tiger face to face and fight with the tiger with his sword. When the tiger was killed, it would be offered the royal order of cremation. This system has been followed even up to the present day by the kṣatriya kings of Jaipur state. The kṣatriyas are specially trained for challenging and killing because religious violence is sometimes a necessary factor. Therefore, kṣatriyas are never meant for accepting directly the order of sannyāsa, or renunciation. Nonviolence in politics may be a diplomacy, but it is never a factor or principle. In the religious law books it is stated: āhaveṣu mitho ’nyonyaṁ jighāṁsanto mahī-kṣitaḥ yuddhamānāḥ paraṁ śaktyā svargaṁ yānty aparāṅ-mukhāḥ yajñeṣu paśavo brahman hanyante satataṁ dvijaiḥ saṁskṛtāḥ kila mantraiś ca te ’pi svargam avāpnuvan “In the battlefield, a king or kṣatriya, while fighting another king envious of him, is eligible for achieving the heavenly planets after death, as the brāhmaṇas also attain the heavenly planets by sacrificing animals in the sacrificial fire.” Therefore, killing on the battlefield on religious principles and killing animals in the sacrificial fire are not at all considered to be acts of violence, because everyone is benefited by the religious principles involved. The animal sacrificed gets a human life immediately without undergoing the gradual evolutionary process from one form to another, and the kṣatriyas killed on the battlefield also attain the heavenly planets, as do the brāhmaṇas who attain them by offering sacrifice. There are two kinds of sva-dharmas, specific duties. As long as one is not liberated, one has to perform the duties of his particular body in accordance with religious principles in order to achieve liberation. When one is liberated, one’s sva-dharma – specific duty – becomes spiritual and is not in the material bodily concept. In the bodily conception of life there are specific duties for the brāhmaṇas and kṣatriyas respectively, and such duties are unavoidable. Sva-dharma is ordained by the Lord, and this will be clarified in the Fourth Chapter. On the bodily plane sva-dharma is called varṇāśrama-dharma, or man’s steppingstone for spiritual understanding. Human civilization begins from the stage of varṇāśrama-dharma, or specific duties in terms of the specific modes of nature of the body obtained. Discharging one’s specific duty in any field of action in accordance with the orders of higher authorities serves to elevate one to a higher status of life.

— vedicscriptures · exposition · source ↗