It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Holy Prophet (peace and blessings of Allah be upon him) said: "By my tongue, the area between the two boundaries of Madinah Munawwarah has been declared as Haram." After a short while, some people from Banu Harithah came. The Holy Prophet (peace and blessings of Allah be upon him) said to them: "I think your residence is going outside the Haram." Then, after pondering for a while, he said: "No, you are within the Haram. No, you are within the Haram."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8887