Garudapurana 1.223.17

1.223.17

anyānyupapurāṇāni munibhiḥ kathitāni tu /
ādyaṃ sanatkumāroktaṃ nārasiṃhamathāparam //

Other Upapurāṇas were spoken by the sages: / the first was spoken by Sanatkumāra, and the next is the Nārasiṃha;