As much as the covenant promised great blessing, the consequence of breaking it is curses (Deuteronomy 28:1–68; Leviticus 26:1–46). So, the Lord finishes his appeal for repentance with a warning of the consequences if the people of Judah continue in their hard-hearted unfaithfulness that is seen outwardly in the evil of your deeds.
The Lord’s wrath will go forth like fire
that is unquenchable if Judah does not turn to him in repentance.
This last sentence also serves to prepare the reader for the next section in Jeremiah 4:5–6:30 which describes in more detail what the Lord’s judgment of Judah will be like. Even though Jeremiah is always urging Judah to repent, his overall expectation is that they will not do so, and that judgment is inevitable.
4 Circoncisez-vous pour l'Eternel, circoncisez vos cœurs, Hommes de Juda et habitants de Jérusalem, De peur que ma colère n'éclate comme un feu, Et ne s'enflamme, sans qu'on puisse l'éteindre, A cause de la méchanceté de vos actions.