Musnad Abu Ya'la al-Mawsili 155:114

And from Abu Hurairah, that the Messenger of Allah (ﷺ) stood at al-Hajun in the year of the Conquest and said: "By Allah, you are the best of Allah's earth, and if I had not been driven out of you, I would not have left. And it was not made lawful for anyone before me, and it was only made lawful for me for an hour of a day. Then, from this hour of mine, it is forbidden; its trees are not to be cut, its grass is not to be mowed, and its lost property is not to be picked up except by one who announces it." A man called Shah—and the people claimed that it was al-Abbas—said: "O Messenger of Allah, except for al-idhkhir (lemon grass), for it is for our houses and our graves." The Messenger of Allah (ﷺ) said: "Except for al-idhkhir."