Our Prophet (saas) foretold that Hazrat Mahdi (as) would reside in a beautiful city with a team of 30 people protecting him

Imam Hazrat Muhammad Baqir (as) related the following:

THE OWNER OF THIS ISSUE, IMAM MAHDI, WILL GO THROUGH A PERIOD OF ISOLATION. DURING THIS TIME OF ISOLATION WHEN HE WILL NEED PROTECTION AND POWER, HE WILL BE ACCOMPANIED BY 30 PEOPLE, SO THAT NO HARM WILL COME TO HIM. FOR THEM, WHAT A BEAUTIFUL RESIDINCE IS MEDINA (THE CITY.)

(Bihar Al-Anwar, Volume 52, page. 153, Hadith. 6)