Srimad Bhagavatam Canto 12, Chapter 12, Text 20

SB 12.12.20

kaurmam matsyam narasimham
 vamanam ca jagat-pateh
ksiroda-mathanam tadvad
 amrtarthe divaukasam
 
Translation: 
 
The Bhagavatam also tells of the appearances of the Lord of the universe as Kurma, Matsya, Narasimha and Vamana, and of the demigods’ churning of the Milk Ocean to obtain nectar.
Srimad Bhagavatam Canto 12, Chapter 12, Text 19
Srimad Bhagavatam Canto 12, Chapter 12, Text 21