Sayyiduna Jabir (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Ibrahim (peace be upon him) made Makkah sacred, and I make sacred the area between the two mountains of Madinah. Its thorny trees are not to be cut, and its game is not to be startled."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9967