Srimad Bhagavatam Canto 10, Chapter 66, Text 01

SB 10.66.1

sri-suka uvaca
nanda-vrajam gate rame
 karusadhipatir nrpa
vasudevo ’ham ity ajño
 dutam krsnaya prahinot
 
Translation: 
 
Sukadeva Gosvami said: O King, while Lord Balarama was away visiting Nanda’s village of Vraja, the ruler of Karusa, foolishly thinking “I am the Supreme Lord, Vasudeva,” sent a messenger to Lord Krsna.
 
Purport: 
 
Since Lord Rama had gone to Nanda-vraja, Paundraka foolishly thought that Lord Krsna would be alone and therefore easy to challenge. Thus he dared to send his crazy message to the Lord.
Srimad Bhagavatam Canto 10, Chapter 66, Text 02