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.