Sahih Bukhari Volume 3, Book 34, Hadith Number 339.

Narated By ‘Abdullah bin Zaid : The Prophet said, “The Prophet Abraham made Mecca a sanctuary, and asked for Allah’s blessing in it. I made Medina a sanctuary as Abraham made Mecca a sanctuary and I asked for Allah’s Blessing in its measures the Mudd and the Sa as Abraham did for Mecca.