Astika spoke to Janamejaya about King Kuru and his ancestors, about the Pandavas and Kauravas, and about the war they fought.
"God himself was there," Astika said.
Janamejaya did not understand. "How could God be there?"
"God took the form of Krishna," said Astika. "Bring the rishi Vaishampayana here, and he will tell you everything. Vaishampayana heard the story from Vyasa. Vyasa was part of the story himself, and he was also an author of the story, the Mahabharata."
So Janamejaya summoned Vaishampayana, who recited the Mahabharata as he heard it from Vyasa, and Janamejaya became enlightened. He knew dharma.