It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that if I were to see a mountain goat wandering in Madinah Munawwarah, even then I would neither frighten it nor touch it, because I have heard the Noble Prophet (peace and blessings be upon him) declare it forbidden to break the leaves of the trees of Madinah or to pluck its thorns.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7475