Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 6
Sanskrit:
पाञ्चजन्यध्वनिं श्रुत्वा युगान्तशनिभीषणम् ।मुर: शयान उत्तस्थौ दैत्य: पञ्चशिरा जलात् ॥ ६ ॥
ITRANS:
pāñcajanya-dhvaniṁ śrutvāyugāntaśani-bhīṣaṇammuraḥ śayāna uttasthaudaityaḥ pañca-śirā jalāt
Translation:
The five-headed demon Mura, who slept at the bottom of the city’s moat, awoke and rose up out of the water when he heard the vibration of Lord Kṛṣṇa’s Pāñcajanya conchshell, a sound as terrifying as the thunder at the end of the cosmic age.