Mbh 3.270.1c

And the three-eyed god, pleased with his austerities deigned to accept his offerings in person. And he also granted him a boon! Do thou listen, O monarch, how the prince received that boon! Jayadratha, addressing that god, asked the boon, ‘May I be able to defeat in battle all the five sons of Pandu on their chariots!’ The god, however, told him ‘This cannot be.’ And Maheswara said, ‘None can slay or conquer them in battle. Save Arjuna, however, thou shall be able to only check them (once) on the field of battle! The heroic Arjuna, with mighty arms, is the god incarnate styled Nara. He practised austerities of old in the Vadari forest. The God Narayana is his friend. Therefore, he is unconquerable of the very gods. I myself have given him the celestial weapon called Pasupata. From the regents also of all the ten cardinal points, he has acquired the thunder-bolt and other mighty weapons. And the great god Vishnu who is the Infinite Spirit, the Lord Preceptor of all the gods, is the Supreme Being without attributes, and the Soul of the Universe, and existeth pervading the whole creation. At the termination of a cycle of ages, assuming the shape of the all-consuming fire, he consumed the whole Universe with mountains and seas and islands and hills and woods and forests. And after the destruction of the Naga world also in the subterranean regions in the same way, vast masses of many-coloured and loud-pealing clouds, with streaks of lightning, spreading along the entire welkin, had appeared on high. Then pouring down water in torrents thick as axles of cars, and filling the space everywhere, these extinguishing that all-consuming fire!