It is narrated from Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) mention Makkah, and he (peace and blessings be upon him) said: "Indeed, Ibrahim (peace be upon him) declared Makkah a sanctuary, and I declare what lies between its two lava plains a sanctuary" — he (peace and blessings be upon him) meant Madinah.
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4311