Jabir bin Abdullah (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "The leaves of the reserve (hima) of the Messenger of Allah (peace and blessings be upon him) are not to be beaten down, nor its trees cut; but they may be gently shaken down."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9978