CC Madhya 20.64

sanātana kahe, — ‘kṛṣṇa āmi nāhi jāni
āmāra uddhāra-hetu tomāra kṛpā māni’
Synonyms: 
sanātana kahe — Sanātana Gosvāmī said; kṛṣṇa — Lord Kṛṣṇa; āmi — I; nāhi jāni — do not know; āmāra — my; uddhāra-hetu — the cause of release; tomāra — Your; kṛpā — mercy; māni — I accept.
Translation: 
Sanātana replied, “I do not know who Kṛṣṇa is. As far as I am concerned, I have been released from prison only by Your mercy.”