Mbh 13.118.3

"'"Vyasa said, 'I have today been worshipped by thee, O king, with diverse words expressive of reverence. Transformed into a worm, thy memory had become clouded. That memory has again appeared. The sin thou committed in a former life has not yet been destroyed,--that sin, viz., which was earned by thee while thou wert a Sudra covetous of wealth and cruel in behaviour and hostile to the Brahmanas. Thou wert able to obtain a sight of my person. That was an act of merit to thee while thou wert a worm. In consequence of thy having saluted and worshipped me thou shalt rise higher, for, from the Kshatriya order thou shalt rise to the status of a Brahmana, if only thou castest off thy life-breaths on the field of battle for the sake of kine or Brahmanas. O prince, enjoying much felicity and performing many sacrifices with copious presents, thou shalt attain to heaven and transformed into eternal Brahma, thou wilt have perfect beatitude. Those that take birth in the intermediate order (of animals) become (when they rise) Sudras. The Sudra rises to the status of the Vaisya; and the Vaisya to that of the Kshatriya. The Kshatriya who takes pride in the discharge of the duties of his order, succeeds in attaining to the status of a Brahmana. The Brahmana, by following a righteous conduct, attains to heaven that is fraught with great felicity.'"'"