A deep tension existed between the prophet and the people, who had been openly mocking his previous actions and accusing him of acting out of madness and drunkenness. To counter their ridicule, God instructs the prophet to deliver a message using the very imagery of wine that they had weaponized against him [אברבנאל]. Rather than performing a physical act, he is told to present a verbal illustration [ביאור שטיינזלץ]. Speaking in God's name [מצודת דוד, ביאור שטיינזלץ], he declares a seemingly obvious fact: every vessel meant for wine will indeed be filled with wine.
The primary approach among commentators is that this vessel is an earthenware jug [רש״י, רד״ק, מלבי״ם, ביאור שטיינזלץ], though another perspective suggests it is a leather flask [מצודת דוד, מצודת ציון]. The earthenware jug is particularly fitting for this metaphor because it is designed exclusively for wine, and its porous walls deeply absorb the liquid [מלבי״ם].
This simple imagery carries a dual threat. First, just as the jug absorbs the liquid and becomes full, the people will be filled with a metaphorical drunkenness. This represents an oncoming wave of severe troubles that will leave them panicked, confused, and entirely stripped of their judgment, much like a drunkard stumbling without direction [רד״ק, אברבנאל]. Second, the metaphor points to absolute ruin. Just as brittle clay jugs shatter into jagged pieces when smashed against one another, the intense pressure of their impending distress will drive the people into violent internal conflicts, causing them to destroy each other [רד״ק].
Embedded within this message is a pointed wordplay. The term used for the jug shares a root with a word for wickedness, signaling that it is the corrupt and worthless individuals who will suffer this disorienting fate. This cleverly turns their own accusations of drunkenness directly back upon them [אברבנאל].
Hearing this parable, the people react with predictable surprise and mockery. They question why the prophet would come in God's name just to state an ordinary, everyday fact. Since it is entirely obvious that a wine jug is meant to be filled with wine, they demand to know the hidden meaning behind his strange and seemingly pointless declaration [מצודת דוד, מלבי״ם, ביאור שטיינזלץ].