Mahabharata 1.16.7

1.16.7

atha parvatarājānaṃ tamananto mahābalaḥ |
ujjahāra balādbrahmansavanaṃ savanaukasam || 7 ||

"Sauti continued, 'O son of Bhrigu! Vishnu with Brahman assented to it. And the lotus-eyed one (Vishnu) laid the hard task on the mighty Ananta, the prince of snakes. The powerful Ananta, directed thereto both by Brahman and Narayana, O Brahmana, tore up the mountain with the woods thereon and with the denizens of those woods. And the gods came to the shore of the Ocean with Ananta and addressed the Ocean, saying, 'O Ocean; we have come to churn thy waters for obtaining nectar.' And the Ocean replied, 'Be it so, as I shall not go without a share of it. I am able to bear the prodigious agitation of my waters set up by the mountain.' The gods then went to the king of tortoises and said to him, 'O Tortoise-king, thou wilt have to hold the mountain on thy back!' The Tortoise-king agreed, and Indra contrived to place the mountain on the former's back.