The Mahabharata/Book 1: Adi Parva/Section CLXVII
Section CLXI
After this citizens returned to their respective houses and the Pandavas continued to dwell at Ekachakra as before.
"Janamejaya said, 'O Brahmana, what did those tigers among men, the Pandavas, do after they had slain the Rakshasa Vaka?'
"Vaisampayana said, 'The Pandavas, O king, after slaying the Rakshasa Vaka, continued to dwell in the abode of that Brahmana, employed in the study of the Vedas. Within a few days there came a Brahmana of rigid vows unto the abode of their host to take up his quarters there. Their host, that bull among Brahmanas, ever hospitable unto all guests, worshipping the newly-arrived Brahmana with due ceremonies, gave him quarters in his own abode. Then those bulls among men, the Pandavas, with their mother Kunti, solicited the new lodger to narrate to them his interesting experiences. The Brahmana spake to them of various countries and shrines and (holy) rivers, of kings and many wonderful provinces and cities. And after this narration was over, that Brahmana, O Janamejaya, also spoke of the wonderful self-choice of Yajnasena's daughter, the princes of Panchala, and of the births of Dhrishtadyumna and Sikhandi, and of the birth, without the intervention of a woman, of Krishna (Draupadi) at the great sacrifice of Drupada.
"Then those bulls among men, the Pandavas, hearing of these extraordinary facts regarding that illustrious monarch (Drupada), and desiring to know the details thereof, asked the Brahmana, after his narration was concluded, to satisfy their curiosity. The Pandavas said, 'How, O Brahmana, did the birth of Dhrishtadyumna the son of Drupada, take place from the (sacrificial) fire? How also did the extraordinary birth of Krishna take place from the centre of the sacrificial platform? How also did Drupada's son learn all weapons from the great bowman Drona? And, O Brahmana, how and for whom and for what reason was the friendship between Drona and Drupada broken off?'
"Vaisampayana continued, 'Thus questioned, O monarch, by those bulls among men, the Brahmana narrated all the particulars about the birth of Draupadi.'"