(4) باب الإحرام وما يتعلق به
'Abdullah bin Zaid bin 'Asim (RAA) narrated that the Messenger of Allah said, "Ibrahim declared Makkah as a Haram (Sanctuary) and made supplication for its people, and I declare Madinah to be a Haram just as Ibrahim declared Makkah as a Haram, and I made supplication for its Mudd and Sa' (refer to hadith no. 650), just as Ibrahim made supplication for the people of Makkah." Agreed upon.
Reference: Bulugh al-Maram 740
In-book reference: Book 6, Hadith 33
English translation: Book 6, Hadith 759