Bhagavatapurana 8.7.7

8.7.7

mathyamāne 'rṇave so 'driranādhāro hy apo 'viśat /
dhriyamāṇo 'pi balibhirgauravāt pāṇḍunandana //

5 & 6. Putting on a smile, He left off the fore part and took hold of the tail, the Immortals following Him. Having thus appointed places for themselves, the sons of Kasyapa churned the sea of milk for Amrita putting forth all their strength and attention; when the sea was being (thus) churned, the unsupported mount went down into the water.

7. In spite of their efforts to hold it up, strong as they were, it sank on account of its weight, O delight of Pandus; when their strength proved futile through the over-powerful Providence they became very much disheartened and the charms of their faces faded.