It was narrated from Ibn 'Abbas (رضي الله عنه) that

The Prophet (ﷺ) said on the day of the conquest (of Makkah): “Its grasses are not to be cut and its game is not to be disturbed; its thorns are not to be cut; and its lost property is not permissible except for one who will announce it.” Al-'Abbas said: Except idhkhir, O Messenger of Allah. He said: “Except idhkhir, for it is permissible.”