Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 19
Sanskrit:
तैस्तैर्नियुद्धविधिभिर्विविधैरच्युतेतरौ । युयुधाते यथान्योन्यं तथैव बलमुष्टिकौ ॥ १९ ॥
ITRANS:
tais tair niyuddha-vidhibhirvividhair acyutetarauyuyudhāte yathānyonyaṁtathaiva bala-muṣṭikau
Translation:
Lord Balarāma and Muṣṭika, expertly displaying numerous wrestling techniques, battled each other in the same way that Lord Kṛṣṇa and His opponent did.