Virtues of Madinah

Narrated Anas bin Malik (Radi-Allahu 'anhu):

The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "There will be no town
which Ad-Dajjal will not enter except Mecca and Medina, and there will be
no entrance (road) (of both Mecca and Medina) but the angels will be
standing in rows guarding it against him, and then Medina will shake with
its inhabitants thrice (i.e. three earth-quakes will take place) and Allah
will expel all the nonbelievers and the hypocrites from it."

Bukhari Vol. 3 : No. 105