Bhagavatapurana 8.2.29

8.2.29

niyudhyatorevamibhendranakrayor vikarṣatorantarato bahirmithaḥ /
samāḥ sahasraṃ vyagaman mahīpate saprāṇayościtramamaṃsatāmarāḥ //

29. O Lord of the earth, while the great elephant and the alligator were thus fighting the duel and were dragging each other from outside and inside and (still) both alive, a thousand years rolled away and at this the Immortals were astonished.