Abu Hassan narrates from Sayyiduna Ali (may Allah be pleased with him), concerning the sanctuary of Madinah, from the Prophet (peace and blessings be upon him), who said: "Its fresh grass is not to be cut, its game is not to be startled, and its lost property is not to be picked up except by one who announces it. It is not proper for a man to carry weapons in it for fighting, and it is not proper for a man to cut a tree from it, except that a man may feed his camel." In Hudbah's narration it is: "a camel".
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9983