[Machine] I heard the Messenger of Allah ﷺ say, "Do not fast on the day of Saturday except what is obligatory upon you. Even if none of you were to break his fast except by eating the bark of a tree." Abu Abdur-Rahman said, "I was informed by Ibn Salim from Az-Zubaidi who said that Al-Fudayl ibn Fadala told us that Khalid ibn Madaan narrated to him that Abdullah ibn Busr narrated to him that he heard his father saying, 'Indeed, the Messenger of Allah ﷺ forbade fasting on the day of Saturday' or similar words to that effect."  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «لَا تَصُومُوا يَوْمَ السَّبْتِ إِلَّا فِيمَا افْتُرِضَ عَلَيْكُمْ وَلَوْ لَمْ يُفْطِرْ أَحَدُكُمْ إِلَّا عَلَى لِحَاءِ شَجَرَةٍ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ حُدِّثْتُ عَنِ ابْنِ سَالِمٍ عَنِ الزُّبَيْدِيِّ قَالَ حَدَّثَنَا الْفُضَيْلُ بْنُ فَضَالَةَ أَنَّ خَالِدَ بْنَ مَعْدَانَ حَدَّثَهُ أَنَّ عَبْدَ اللهِ بْنَ بُسرٍ حَدَّثَهُ أَنَّهُ سَمِعَ أَبَاهُ يَقُولُ إِنَّ رَسُولَ اللهِ ﷺ «نَهَى عَنْ صِيَامِ يَوْمِ السَّبْتِ» نَحْوَهُ