It was narrated from ‘Abdullah bin Busr that the Messenger of Allah (ﷺ) said: “Do not fast on Saturdays apart from days when you are obliged to fast. If anyone of you cannot find anything other than grape stalks or the bark of a tree, let him suck on it.” Another chain from 'Abdullah bin Busr, from his sister who said: "The Messenger of Allah (ﷺ) said," and he mentioned similarly.

تلتقي أسانيد هذه الأحاديث عند عبد الله بن بسر (ت ٨٢) — يمر به ٥٦ من ٥٨ إسناداً، على ٦ رواة في أعلاها.