Sahih Muslim Book 7, Hadith Number 3151.

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.

Rafi’ b. Khadij reported Allah’s Messenger (may peace be upon him) as saying: Ibrahim declared Mecca as sacred and I declare sacred the area between its two stony grounds (lava lands by which he meant Medina).