Mbh 13.139.3a

"'Bhishma said, "I shall certainly recite to thee discourses that are delightful, on the subject, O king, of the puissance of this Vishnu as displayed in days of yore and as I have heard (from my preceptors). Listen to me also as I describe the puissance of that great god who has a bull for his device. Listen to me as I narrate also the doubt that filled the mind of the spouse of Rudra and that of Rudra himself. Once on a time the righteous souled Krishna observed a vow extending for ten and two years. For beholding him who had gone through the rite of initiation for the observance of his great vow, there came to that place Narada and Parvata, and the Island-born Krishna, and Dhaumya, that foremost of silent reciters, and Devala, and Kasyapa, and Hastikasyapa. Other Rishis also, endued with Diksha and self-restraint, followed by their disciples and accompanied by many Siddhas and many ascetics of great merit, came there. The son of Devaki offered them such honours of hospitality as are deserving of the highest praise and as are offered unto the gods alone. Those great Rishis sat themselves down upon seats some of which were green and some endued with the colour of gold and some that were fraught with the plumes of the peacock and some that were perfectly new and fresh. Thus seated, they began to converse sweetly with one another on subjects connected with Religion and duty as also with many royal sages and deities. At that time the energy, in the form of fire, Narayana, rising from the fuel that consisted of the rigid observance of his vow, issued out of the mouth of Krishna of wonderful feats. That fire began to consume those mountains with their trees and creepers and little plants, as also with their birds and deer and beasts of prey and reptiles. Soon the summit of that mountain presented a distressing and pitiful appearance, Inhabited by animals of diverse kinds which began to utter cries of woe and pain, the summit soon became bereft of every living creature.