There are at the approaches of Medina angels so that plague and the Dajjal shall not penetrate into it.
Sahih Muslim Book 15, Hadith 554
← Previous Hadith None who shows endurance on the hardships of Medina,... (the rest of the hadith is the same).

Sahih Muslim Book 15, Hadith 553 Next Hadith → Dajjal will come from the eastern side with the intention of attacking Medina until he will get down behind Uhud. Then the angels will turn his face towards Syria and there he will perish.

Sahih Muslim Book 15, Hadith 555