mokṣasaṃnyāsayoga - Verse śloka 41
śloka 41
brāhmaṇakṣatriyaviśāṃ śūdrāṇāṃ ca parantapa |
karmāṇi pravibhaktāni svabhāvaprabhavairguṇaiḥ ||18-41||
Translation
O scorcher of foes! The duties of Brahmanas, Kshatriyas, Vaishyas and Shudras are divided according to the Gunas born of their nature.