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
Hadith No. 1726
Sunan Ibn Majah
Gradings:
Al-Albani:
Sahih
Muhammad Fouad Abd al-Baqi:
Sahih
Shuaib Al Arnaut:
Sahih
Zubair Ali Zai:
Isnaad Hasan