וְהָיָה֙ הָאִ֣ישׁ הַה֔וּא כֶּֽעָרִ֛ים אֲשֶׁר־הָפַ֥ךְ יְהוָ֖ה וְלֹ֣א נִחָ֑ם וְשָׁמַ֤ע זְעָקָה֙ בַּבֹּ֔קֶר וּתְרוּעָ֖ה בְּעֵ֥ת צָהֳרָֽיִם׃
And let that man be as the cities Which the LORD overthrew, and repented not; And let him hear a cry in the morning, And an alarm at noontide;
Rashi on Jeremiah
like the cities that...overturned Namely Sodom and Gemorrah.
Rashi on Jeremiah
and did not repent Since He decreed destruction upon them, he did not think another thought to rescind His decree.