The Great Epic of the Bhārata dynasty 1.54.4

1.54.4

yaṃ nātitapasā kaścinna vedādhyayanena ca |
na vratairnopavāsaiśca na prasūtyā na manyunā || 4 ||

'Sauti said, 'Hearing that Janamejaya was installed in the snake-sacrifice, the learned Rishi Krishna-Dwaipayana went thither on the occasion. And he, the grand-father of the Pandavas, was born in an island of the Yamuna, of the virgin Kali by Sakti's son, Parasara. And the illustrious one developed by his will alone his body as soon as he was born, and mastered the Vedas with their branches, and all the histories. And he readily obtained that which no one could obtain by asceticism, by the study of the Vedas, by vows, by fasts, by progeny, and by sacrifice. And the first of Veda-knowing ones, he divided the Vedas into four parts. And the Brahmana Rishi had knowledge of the supreme Brahma, knew the past by intuition, was holy, and cherished truth. Of sacred deeds and great fame, he begot Pandu and Dhritarashtra and Vidura in order to continue the line of Santanu.