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. (Using translation from Abū Dāʾūd 2421)
أَنَّ النَّبِيَّ ﷺ قَالَ «لَا تَصُومُوا يَوْمَ السَّبْتِ إِلَّا فِيمَا افْتُرِضَ عَلَيْكُمْ وَإِنْ لَمْ يَجِدْ أَحَدُكُمْ إِلَّا لِحَاءَ عِنَبَةٍ أَوْ عُودَ شَجَرَةٍ فَلْيَمْضُغْهَا»
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