ब्राह्मण क्षत्रिय विशाम् शूद्राणाम् च परन्तप​
कर्माणि प्रविभक्तानि स्वभाव प्रभवैः गुणैः

ब्राह्मणक्षत्रियविशां शूद्राणां च परन्तप ।
कर्माणि प्रविभक्तानि स्वभावप्रभवैर्गुणैः ॥१८:४१॥

braahmanakshatriyavishaam shoodraanaam cha parantapa
karmaani pravibhaktaani swabhaavaprabhavairgunaih ||18:41||

braahmana kshatriya vishaam shudraanaam cha parantapa
karmaani pravibhaktaani swabhaava prabhavaih gunaih

Purport Braahman, Kshetriya, Vaishya and Shudra are, O subduer of enemies (O Arjun) distinguished by characters of their own actions born of the (three) characteristics.

ब्राह्मण (braahmana) -- the Braahmans; the class of people with Vedic knowledge
क्षत्रिय (kshatriya) -- the Kshatriyas; the class of people protecting others
विशाम् (vishaam) -- the Vaishyas; class of people producing and distributing
शूद्राणाम् (shoodraanaam) -- the Shudras; class of people helping the other classes
च (cha) -- also; and
परन्तप (parantapa) -- subduer of the enemies; Arjun
कर्माणि (karmaani) -- actions; activities
प्रविभक्तानि (pravibhaktaani) -- divisions; distinguishing
स्वभाव (swabhaava) -- own nature; own sentiments
प्रभवैः (prabhavaih) -- born of; originated
गुणैः (gunaih) -- qualities; characters