He, who takes every sort of food, who is engaged in doing every sort of work, who is impure in behaviour, who does not study the Vedas, and whose conduct is unrighteous, is said to be a Shudra.
सर्वभक्षरतिनित्यं सर्वकर्मकरोऽशुचिः। त्यक्तवेदस्त्वनाचारः स वै शूद्र इति स्मृतः॥