Hadith 2421
Narrated As-Samma sister of Abdullah ibn Busr: The Prophet ﷺ said: Do not fast on Saturday except what has been made obligatory on you; and if one of you can get nothing but a grape skin or a piece of wood from a tree, he should chew it.
Hadith 2628
Narrated Abu Thalabah al-Khushani: When the people encamped, (the narrator Amr ibn Uthman al-Himsi) said: When the Messenger of Allah ﷺ encamped, the people scattered in the glens and wadis. The Messenger of Allah ﷺ said: Your scattering in these glens and wadis is only of the devil. They afterwards kept close together when they encamped to such an extent that it used to be said that if a cloth were spread over them, it would cover them all.