PART 11, CHAPTER 17, VERSE 19, SANSKRIT:
s'us'ruushanam dvija gavaam devaanaam ca apy amaayayaa
tatra labdheena santooshaha, s'uudra-prakritayas tv imaaha.
VERSE 49
suudra-vruttim bhajeed vais'yaha, s'uudraha kaaru-katha-kriyaam
kricchraan muktoo na garhyeena vruttim lipseeta karmanaa.
ENGLISH GIST:
Serving the Priests, cows, Gods, without cheating and being happy with whatever he gets -- these are the duties of a Suudra.
A fourth caste person who cannot find a master to serve, can overcome his difficult situation by weaving baskets and straw mats. Again they should revert back to their original occupations after normalcy occurs. (That means a fourth caste person should find a master and serve again).
CRITICAL REMARKS: Who stipulated these duties? Did Krishna stipulate? Or the priests stipulated?