Srimad Bhagvata Mahapurana: Book 10: Chapter 66: Verses 1-14
Paundraka and others killed
Sri Suka began again : Pariksit, when Sri Balarama had gone to Nanda's Vraja, Paundraka, the ruler of Karusa, sent a messenger to Sri Krsna, saying, " I am Vasudeva"l Steeped as he was in ignorance, he was flattered by stupid people, who said, " You are the glorious Lord Vasudeva, protector of the universe, who have appeared on earth (for its protection)", and the fellow began to look upon himself as Vasudeva (the immortal Lord). Just as a foolish boy set up by other boys as a king in sport would behave, so did the dull-witted fellow, unaware of the reality of Bhagavan Sri Krsna, whose ways are inscrutable, sent his messenger to Dwaraka. The messenger came to Dwaraka and delivered (the following) message of his king to Lord Sri Krsna of lotus-like eyes, who was seated in the council hall. "I alone am Vasudeva, and there is no other. I have come down on earth to bless all beings with my grace. You have falsely assumed that name, which you should now give up. 0 scion of Yadu, abandon all my marks that you have adopted through (sheer) folly and come to me for shelter, or you should give me battle." Sri Suka continued : Hearing this bragging of the dull-witted Paundraka, King Ugrasena and (all) others who were present in the assembly at that time loudly laughed.