(87) باب صِيَانَةِ الْمَدِينَةِ مِنْ دُخُولِ الطَّاعُونِ وَالدَّجَّالِ إِلَيْهَا
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:
There are at the approaches of Medina angels so that plague and the Dajjal shall not penetrate into it.
Reference: Sahih Muslim 1379
In-book reference: Book 15, Hadith 554
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 3186