Mbh 5.99.1b

It was here that the Lord of creatures--that great Master of all created things--Mahadeva--had practised the severest of ascetic austerities for the benefit of all creatures. Here dwell many regenerate and great Rishis observant of vows called ‘Go’ and emaciated with the recitation and study of the Vedas, and who, having suspended the vital air called Prana, have attained to heaven by force of their austerities. A man is said to adopt the vow called Go, when he sleepeth wherever he listeth, and when he subsisteth on anything that others place before him, and is clad with robes that others may supply. Here in the race of the celebrated elephant Supratika were born those best of elephants known by the names of Airavata, Vamana, Kumuda and Anjana, the first being the king of his tribe. Look, O Matali, if there be any bridegroom here, that is distinguished by the possession of superior merits, for then I will go to him for respectfully soliciting him to accept thy daughter. Behold, here lieth an egg in these waters, blazing with beauty. From the commencement of the creation it is here. It moveth not, nor doth it burst. I have never heard any body speaking of its birth or nature. Nobody knoweth who its father or mother is. It is said, O Matali, that when the end of the world cometh, mighty fire burst forth from within it, and spreading consumeth the three worlds with all their mobile and immobile objects.’ Hearing those words of Narada, Matali answered him, saying, ‘No one here seems to me to be eligible. Let us go hence, therefore, without delay!’”’”