It is said that the duty of the Shudra is to serve the twice-born ones. The (Shudra) cannot beg alms, perform Homas and observe vows. They are to live in their master's house. same..
शुश्रूषा च द्विजातीनां शूद्राणां धर्म उच्यते। भैक्ष्यहोमव्रतैींनास्तथैव गुरुवासिताः॥