One verse

Srimad Bhagavatam 1.3.16

1.3.16

सुरासुराणामुदधिं मथ्नतां मन्दराचलम् । दध्रे कमठरूपेण पृष्ठ एकादशे विभु: ॥ १६ ॥

surasuranam udadhim mathnatam mandaracalam dadhre kamatha-rupena prstha ekadase vibhuh

sura
the theists
asuranam
of the atheists
udadhim
in the ocean
mathnatam
churning
mandaracalam
the Mandaracala Hill
dadhre
sustained
kamatha
tortoise
rupena
in the form of
prsthe
shell
ekadase
the eleventh in the line
vibhuh
the great.

The eleventh incarnation of the Lord took the form of a tortoise whose shell served as a pivot for the Mandaracala Hill, which was being used as a churning rod by the theists and atheists of the universe.