SB 12.12.20

kaurmaṁ mātsyaṁ nārasiṁhaṁ
 vāmanaṁ ca jagat-pateḥ
kṣīroda-mathanaṁ tadvad
 amṛtārthe divaukasām
Synonyms: 
kaurmam — the incarnation as a tortoise; mātsyam — as a fish; nārasiṁham — as a man-lion; vāmanam — as a dwarf; ca — and; jagat-pateḥ — of the Lord of the universe; kṣīra-uda — of the Ocean of Milk; mathanam — the churning; tadvat — thus; amṛta-arthe — for the sake of nectar; diva-okasām — on the part of the inhabitants of heaven.
Translation: 
The Bhāgavatam also tells of the appearances of the Lord of the universe as Kūrma, Matsya, Narasiṁha and Vāmana, and of the demigods’ churning of the Milk Ocean to obtain nectar.