Āpastamba Dharmasūtras part 1. And now we shall explain the accepted customary Laws, 2. the authority for which rests on their acceptance by those who know the Law 3. and on the Vedas. There are 4 classes: 1. Brahmin, 2. Kṣatriya, 3. Vaiśya, and 4. Śūdra. 5. Among these, each preceding class is superior by birth to each subsequent. Śūdras are to serve other classes