The demigods and demons worked almost madly for the nectar, encouraged by the Lord, who was above and below the mountain and who had entered the demigods, the demons, Vāsuki and the mountain itself. Because of the strength of the demigods and demons, the Ocean of Milk was so powerfully agitated that all the alligators in the water were very much perturbed. Nonetheless the churning of the ocean continued in this way.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
उपर्यधश्चात्मनि गोत्रनेत्रयोः परेण ते प्राविशता समेधिताः । ममन्थुरब्धिं तरसा मदोत्कटा महाद्रिणा क्षोभितनक्रचक्रम्
uparyadhaścātmani gotranetrayoḥ pareṇa te prāviśatā samedhitāḥ | mamanthurabdhiṃ tarasā madotkaṭā mahādriṇā kṣobhitanakracakram
SB 8.7.13