Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 16
Sanskrit:
कुम्भाण्डकूपकर्णश्च पेततुर्मुषलार्दितौ ।दुद्रुवुस्तदनीकानि हतनाथानि सर्वत: ॥ १६ ॥
ITRANS:
kumbhāṇḍa-kūpakarṇaś capetatur muṣalārditaududruvus tad-anīkanihata-nāthāni sarvataḥ
Translation:
Kumbhāṇḍa and Kūpakarṇa, tormented by Lord Balarāma’s club, fell down dead. When the soldiers of these two demons saw that their leaders had been killed, they scattered in all directions.