Musnad Ahmed: Hadith 2272

The Messenger of Allah (ﷺ) said: "Allah, may He be glorified and exalted, made Makkah a sanctuary. It was not permitted for anyone before me (to fight therein) and it will not be permissible for anyone after me (to do so). Rather (fighting therein) was only permitted for part of a day. Its green grass is not to be cut, its trees are not to be chopped down, its game is not to be disturbed and its lost property is not to be picked up except by the one who announces it." al-'Abbas said: Except idhkhir (a kind of grass), for it is used by our blacksmiths and in our graves. He said: " Except idhkhir.”