The Mahabharata/Book 1: Adi Parva…
“ If, from that union, for the welfare of the snakes, a son be born, then he, possessed of energy, will save us all from the snake-sacrifice. The Grandsire had said so, of old, in the midst of the gods. O fortunate one, hast thou conceived from thy union with that best of Rishis? My heart's desire is that my bestowal of thee on that wise one may not be fruitless. ”
