The Great Epic of the Bhārata dynasty 2.5.116

2.5.116

nārada uvāca |
evaṃ yo vartate rājā cāturvarṇyasya rakṣaṇe |
sa vihṛtyeha susukhī śakrasyaiti salokatām || 116 ||

"Vaisampayana continued,--The illustrious bull among the Kurus, having heard these words of that best of Brahmanas, bowed down unto him and worshipped his feet. And gratified with everything he heard, the monarch said unto Narada of celestial form,--"I shall do all that thou hast directed, for my knowledge hath expanded under thy advice!' Having said this the king acted conformably to that advice, and gained in time the whole Earth bounded by her belt of seas. Narada again spoke, saying,--"That king who is thus employed in the protection of four orders, Brahmanas, Kshatriyas, Vaishyas, and Sudras, passeth his days here happily and attaineth hereafter to the region of Sakra (heaven).'"