Why was belshazzar punished?

Belshazzar was punished for his blasphemy and sacrilege against God. During a feast, he used sacred vessels taken from the Jewish Temple to drink wine and praise pagan gods. This act of hubris and disrespect prompted a divine judgment, symbolized by the mysterious writing on the wall, which foretold the end of his reign. Consequently, Belshazzar was killed that very night, and his kingdom fell to the Medes and Persians.