Mbh 7.201.10a

“‘Vyasa continued, “The blue-throated God, of inconceivable soul, that wielder of Pinaka, that divine Lord ever praised by the Rishis, then gave boons unto Vasudeva who deserved them all. The great God said, ‘O Narayana, through my grace, amongst men, gods, and Gandharvas, thou shalt be of immeasurable might and soul. Neither gods, nor Asuras, nor great Uragas, nor Pisachas, nor Gandharvas, nor men, nor Rakshasas, nor birds, nor Nagas, nor any creatures in the Universe, shall ever be able to bear thy prowess. No one amongst even the celestials shall be able to vanquish thee in battle. Through my grace, none shall ever be able to cause thee pain by the weapon of thunderbolt or with any object that is wet or dry, or with any mobile or immobile thing. Thou shalt be superior to myself if thou ever goest to battle against me.’ Thus were these boons acquired by Sauri in days of yore. Even that God now walketh the earth (as Vasudeva), beguiling the universe by his illusion. From Narayana’s asceticism was born a great Muni of the name of Nara, equal to Narayana himself. Know that Arjuna is none else than that Nara. Those two Rishis, said to be older than the oldest gods, take their births in every Yuga for serving the purposes of the world. Thyself also, O thou of great heart, hast been born as a portion of Rudra, by virtue of all thy religious acts and as a consequence of high ascetic austerities, endued with great energy and wrath. Thou wert (in a former life) endued with great wisdom and equal to a god. Regarding the universe to consist only of Mahadeva, thou hadst emaciated thyself by diverse vows from desire of gratifying that God. Assuming the form of a very superior person, that blazes fourth with splendour, thou hast, O giver of honours, worshipped the great god with mantras, with homa, and with offerings.