Sayyiduna Adi bin Zayd (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) declared a protected area (hima) of one barid (about twelve miles) on every side of Madinah, whose trees are not to be beaten for leaves nor cut, except for a stick with which an animal is driven.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14344