Habib bin Abi Thabit (may Allah have mercy on him) narrated: I heard Sayyiduna Ibn Abbas (may Allah be pleased with them both) say: The Messenger of Allah (peace and blessings be upon him) said: "Makkah is the sanctuary of Allah, inviolable: its grass is not to be cut, its trees are not to be felled, and its wild animals are not to be frightened." Abbas (may Allah be pleased with him) said: O Messenger of Allah, except idhkhir (a fragrant grass), for it is for our blacksmiths' work and for the roofs of our houses. He (peace and blessings be upon him) said: "Except idhkhir."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12624