Mbh 1.178.6

“A little while after, O Bharata, that best of monarchs, deprived of all his senses by the Rakshasa within him, beholding Saktri who had cursed him, said, ‘Because thou hast pronounced on me this extraordinary curse, therefore, I shall begin my life of cannibalism by devouring thee.’ Having said this, the king immediately slew Saktri and ate him up, like a tiger eating the animal it was fond of. Beholding Saktri thus slain and devoured, Viswamitra repeatedly urged that Rakshasa (who was within the monarch) against the other sons of Vasishtha. Like a wrathful lion devouring small animals, that Rakshasa soon devoured the other sons of the illustrious Vasishtha that were junior to Saktri in age. But Vasishtha, learning that all his sons had been caused to be slain by Viswamitra, patiently bore his grief like the great mountain that bears the earth. That best of Munis, that foremost of intelligent men, was resolved rather to sacrifice his own life than exterminate (in anger) the race of Kusikas. The illustrious Rishi threw himself down from the summit of Meru, but he descended on the stony ground as though on a heap of cotton. And, O son of Pandu, when the illustrious one found that death did not result from that fall, he kindled a huge fire in the forest and entered it with alacrity. But that fire, though burning brightly, consumed him not. O slayer of foes, that blazing fire seemed to him cool. Then the great Muni under the influence of grief, beholding the sea, tied a stony weight to his neck and threw himself into its waters. But the waves soon cast him ashore. At last when that Brahmana of rigid vows succeeded not in killing himself by any means, he returned, in distress of heart, to his asylum.’”