SB 8.8.31
athodadher mathyamanat
kasyapair amrtarthibhih
udatisthan maharaja
purusah paramadbhutah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O King, thereafter, while the sons of Kasyapa, both demons and demigods, were engaged in churning the Ocean of Milk, a very wonderful male person appeared.