Sahih Muslim Book 7, Hadith Number 3173.

Chapter : Eminence of Medina, Allah’s Apostle (may peace be upon him) showered blessings upon it. Its sacredness and unlawfulness of hunting and lopping of trees and demarcation its precincts.

Abu Sa’id al-Kbudri (Allah be pleased with him) reported that Allah’s Messenger (may peace be upon him) said: O Allah, bless us in our sa’ and mud and shower with its blessings two other blessings (multiply blessings showered upon it).