Mahabharat
वदतां वर्णधर्मांश च बराह्मणानां हि मे शरुतम कषत्रियस्य सदा धर्मॊ नान्यः शत्रुनिबर्हणात ॥ ४-२०-२८ ॥
'I have heard it from Brahmanas well-versed in the duties of the four orders, that a Kshatriya has no higher duty than the subjugation of enemies.' ॥ 4-20-28 ॥
english translation
vadatAM varNadharmAMza ca barAhmaNAnAM hi me zarutama kaSatriyasya sadA dharmò nAnyaH zatrunibarhaNAta ॥ 4-20-28 ॥
hk transliteration by Sanscript