SB 10.43.16

vṛtau gopaiḥ katipayair
 baladeva-janārdanau
raṅgaṁ viviśatū rājan
 gaja-danta-varāyudhau
Word for word: 
vṛtau — surrounded; gopaiḥ — by cowherd boys; katipayaiḥ — several; baladeva-janārdanau — Balarāma and Kṛṣṇa; raṅgam — the arena; viviśatuḥ — entered; rājan — O King (Parīkṣit); gaja-danta — the elephant’s tusks; vara — chosen; āyudhau — whose weapons.
Translation: 
My dear King, Lord Baladeva and Lord Janārdana, each carrying one of the elephant’s tusks as His chosen weapon, entered the arena with several cowherd boys.