Mudgalapurana 4.6.162

4.6.162

atha taṃ jāmbavān kṛṣṇamuvāca ghananiḥsvanaḥ |
kastvaṃ vīra mahātejā yodhayannasi māṃ vada ||

Then Jāmbavat, with a voice deep as thunder, said to Kṛṣṇa: / "Who are you, heroic one of great splendor, who are fighting me? Tell me!"