The Lord tells Jeremiah to buy a linen belt and put it on his waist without dipping it in water. Then he tells him to take it to the Euphrates and hide it in a cleft of the rock. Many days later he tells him to dig it up: the belt is ruined, good for nothing. The Lord explains that he will ruin the pride of Judah and Jerusalem, this evil people who refuse to listen. As a belt clings to a man's waist, he made the whole house of Israel and the whole house of Judah cling to him, to be his people, his renown, his praise and his glory, but they would not listen.
Then Jeremiah is to tell them that every jar will be filled with wine. When they answer that they know, he is to explain that the Lord will fill all the inhabitants with drunkenness, kings, priests and prophets, and dash them against one another, fathers and sons, without pity.
In verses 15-27 the prophet pleads with them to listen and give glory to the Lord before he brings darkness. If they will not listen, his soul will weep in secret for their pride, and the Lord's flock will be taken captive. To the king and the queen mother he says to humble themselves, for their crown has fallen. The cities of the Negeb will be shut up and all Judah carried into exile. He asks what Jerusalem will say when the Lord sets over her as head those she herself taught to be allies.
One of the best-known questions is in verse 23: can the Ethiopian change his skin or the leopard his spots? Then also you can do good who are accustomed to do evil. So the Lord will scatter them like chaff driven by the desert wind, because they forgot him and trusted in lies. The chapter ends with a lament: woe to you, Jerusalem! How long will you remain unclean?