The Messenger of Allah ﷺ said, "The last of the cities of Islam to fall into ruin will be Madinah."
حدثنا أبو السائب سلم بن جنادة أخبرنا أبي جنادة بن سلم عن هشام بن عروة عن أبيه
قال رسول الله ﷺ آخر قرية من قرى الإسلام خرابا المدينة
No references are available.
[Its chain of transmission is daif] Ibn Hibban also reported it, no. 1041, and Dani in Sunan al-Warida fi al-Fitan, 4/891, no. 460, both from the narration of Salm bin Junada with the same chain, and Suyuti and others graded it daif (!). Junada was graded daif by a group of scholars and graded reliable by another group, and Saji said, "He narrated a munkar hadith from Hisham bin Urwa."