“Drink from the temple vessels”
Belshazzar gave orders to bring in the gold and silver vessels that Nebuchadnezzar his father had taken from the temple in Jerusalem, so that the king could drink from them (Daniel 5:2 BSB)
What it sounds like today
A king just showing off fancy looted tableware.
The cultural key
On the surface this is a lavish, drunken flourish, using captured treasure as party cups. In context it is a calculated act of religious defiance. The gold and silver vessels had been consecrated to the LORD in the Jerusalem temple; to profane them as drinking cups at a pagan banquet, and specifically to do so while 'they praised their gods of gold and silver, bronze and iron, wood and stone' (5:4), was a deliberate boast that the gods of Babylon had triumphed over the God of Israel. It treated the holy things of the living God as trophies of a defeated deity. Daniel spells out the offense: 'you have exalted yourself against the Lord of heaven... the vessels from His house were brought to you,' and 'you have failed to glorify the God who holds your very breath' (5:23). That is precisely why the disembodied hand writes Belshazzar's doom on the wall that very night, and why he is slain before morning. The party is not the point; the blasphemy is.
Recovered meaning
Belshazzar drinking from the temple vessels is deliberate blasphemy, not just excess: profaning the LORD's holy vessels while toasting Babylon's idols boasted that Babylon's gods had beaten Israel's God. This act of defiance triggers the writing on the wall and his death that night.