SB 10.43.40

tasmād bhavadbhyāṁ balibhir
 yoddhavyaṁ nānayo ’tra vai
mayi vikrama vārṣṇeya
 balena saha muṣṭikaḥ
Word for word: 
tasmāt — therefore; bhavadbhyām — You two; balibhiḥ — with those who are strong; yoddhavyam — should fight; na — there is not; anayaḥ — injustice; atra — in this; vai — certainly; mayi — to me; vikrama — (show) Your prowess; vārṣṇeya — O descendant of Vṛṣṇi; balena saha — with Balarāma; muṣṭikaḥ — Muṣṭika (should fight).
Translation: 
Therefore You two should fight powerful wrestlers. There’s certainly nothing unfair about that. You, O descendant of Vṛṣṇi, can show Your prowess against me, and Balarāma can fight with Muṣṭika.
Purport: 

Thus end the purports of the humble servants of His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda to the Tenth Canto, Forty-third Chapter, of the Śrīmad-Bhāgavatam, entitled “Kṛṣṇa Kills the Elephant Kuvalayāpīḍa.”