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SB 12.7.7
kasyapo ’ham ca savarni
rama-sisyo ’krtavranah
adhimahi vyasa-sisyac
catvaro mula-samhitah
Translation:
Romaharsana, a disciple of Vedavyasa, divided the Puranas into four basic compilations. The sage Kasyapa and I, along with Savarni and Akrtavrana, a disciple of Rama, learned these four divisions.