Śrīmad-Bhāgavatam · Text 10.16.30
Who is speaking and story frame
तच्चित्रताण्डवविरुग्नफणासहस्रो
रक्तं मुखैरुरु वमन्नृप भग्नगात्र: ।
स्मृत्वा चराचरगुरुं पुरुषं पुराणं
नारायणं तमरणं मनसा जगाम ॥ ३० ॥
tac-citra-tāṇḍava-virugna-phaṇā-sahasro
raktaṁ mukhair uru vaman nṛpa bhagna-gātraḥ
smṛtvā carācara-guruṁ puruṣaṁ purāṇaṁ
nārāyaṇaṁ tam araṇaṁ manasā jagāma
My dear King Parīkṣit, Lord Kṛṣṇa’s wonderful, powerful dancing trampled and broke all of Kāliya’s one thousand hoods. Then the serpent, profusely vomiting blood from his mouths, finally recognized Śrī Kṛṣṇa to be the eternal Personality of Godhead, the supreme master of all moving and nonmoving beings, Śrī Nārāyaṇa. Thus within his mind Kāliya took shelter of the Lord.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.