Musnad Ahmad 30:357

Yazid narrated to us, Ibn Abi Dhi'b informed us, from Muslim ibn Jundub, from Habib al-Hudhali, from Abu Hurayrah, who said: If I were to see the mountain goats roaming between its two lava fields—meaning Medina—I would not startle them nor touch them. That is because I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Its trees are forbidden to be beaten or cut."