Mbh 3.141.2a

“Hearing the words of the high-souled Lomasa, the son of Pandu reverentially worshipped the river (Ganga), flowing through the firmament. And after having adored her the pious sons of Pandu resumed their journey accompanied by the sages. And it came to pass that those best of men beheld at a distance some white object of vast proportions, even like Meru and stretching on all sides. And knowing that Pandu’s sons were intent upon asking (him), Lomasa versed in speech said, ‘Hear, O sons of Pandu! O best of men, what ye see before you, of vast proportions like unto a mountain and beautiful as the Kailasa cliff, is a collection of the bones of the mighty Daitya Naraka, Being placed on a mountain, it looketh like one. The Daitya was slain by that Supreme Soul, the eternal God Vishnu, for the good of the lord of celestials. Aiming at the possession of Indra’s place, by the force of austere and Vedic lore, that mighty-minded (demon) had practised austere penances for ten thousand years. And on account of his asceticism, as also of the force and might of his arms he had grown invincible and always harassed (Indra). And O sinless one, knowing his strength and austerities and observance of religious vows, Indra became agitated and was overwhelmed with fear. And mentally he thought of the eternal deity, Vishnu. And thereat the graceful lord of the universe, who is present everywhere, appeared and stood before him manifest. And the sages and celestials began to propitiate Vishnu with prayers. And in his presence even Agni of the six attributes and of blazing beauty being overpowered by his effulgence, became shorn of radiance and seeing before him the God Vishnu, the chief of the celestials who wields the thunder-bolt, bowing with head down readily apprised Vishnu of the source of his fear. Thereupon Vishnu said, ‘I know, O Sakra, that thy fear proceedeth from Naraka, that lord of the Daityas. By the merit of his successful ascetic acts he aimeth at Indra’s position.