CC Madhya 24.347

nija-granthe karṇapūra vistāra kariyā
sanātane prabhura prasāda rākhiyāche likhiyā
Word for word: 
nija-granthe — in his own book; karṇapūra — Kavi-karṇapūra; vistāra kariyā — vividly describing; sanātane — unto Sanātana Gosvāmī; prabhura — of Lord Śrī Caitanya Mahāprabhu; prasāda — the mercy; rākhiyāche — has kept; likhiyā — writing.
Translation: 
The authorized poet Kavi-karṇapūra has written a book named Caitanya-candrodaya-nāṭaka. This book tells how Śrī Caitanya Mahāprabhu blessed Sanātana Gosvāmī with His specific mercy.