Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 23
Sanskrit:
अथ तावपि सङ्क्रुद्धावुद्यम्य कुरुनन्दन ।एरकामुष्टिपरिघौ चरन्तौ जघ्नतुर्युधि ॥ २३ ॥
ITRANS:
atha tāv api saṅkruddhāvudyamya kuru-nandanaerakā-muṣṭi-parighaucarantau jaghnatur yudhi
Translation:
O son of the Kurus, Kṛṣṇa and Balarāma then became very angry. Picking up cane stalks, They moved about within the battle and began to kill with these clubs.