[Machine] I heard Abdullah ibn Busr al-Mazini, a companion of the Messenger of Allah ﷺ , saying, "Do you see this hand of mine? I pledged allegiance with it to the Messenger of Allah ﷺ . And I heard him saying, 'Do not fast on Saturdays unless it is an obligatory fast upon you, even if one of you cannot find anything except the bark of a tree, let him break his fast on it.'"  

سَمِعْتُ عَبْدَ اللَّهِ بْنَ بُسْرٍ الْمَازِنِيَّ صَاحِبَ رَسُولِ اللَّهِ ﷺ يَقُولُ تَرَوْنَ يَدِي هَذِهِ؟ بَايَعْتُ بِهَا رَسُولَ اللَّهِ ﷺ وَسَمِعْتُهُ يَقُولُ «لَا تَصُومُوا يَوْمَ السَّبْتِ إِلَّا فِيمَا افْتُرِضَ عَلَيْكُمْ وَلَوْ لَمْ يَجِدْ أَحَدُكُمْ إِلَّا لِحَاءَ شَجَرَةٍ فَلْيُفْطِرْ عَلَيْهِ»  

[Machine] He informed him that Ibn Abbas and some of the companions of the Messenger of Allah ﷺ had sent me to Umm Salamah to ask her on which days did the Messenger of Allah ﷺ fast the most. She replied, "On Saturdays and Sundays." I returned and informed them, and it appeared that they denied that. So, they all went to her and said, "We have been sent to you about this matter, and you mentioned that he said such and such." She said, "Indeed, it is true that the Messenger of Allah ﷺ used to fast the most on Saturdays and Sundays, and he would say, 'These are the feasts of the pagans, and I want to be different from them.'"  

أَخْبَرَهُ أَنَّ ابْنَ عَبَّاسٍ وَنَاسًا مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ بَعَثُونِي إِلَى أُمِّ سَلَمَةَ أُسَائِلُهَا عَنْ أَيِّ الْأَيَّامِ كَانَ رَسُولُ اللَّهِ ﷺ أَكْثَرَ لِصِيَامِهَا؟ فَقَالَتْ يَوْمَ السَّبْتِ وَالْأَحَدِ فَرَجَعْتُ إِلَيْهِمْ فَأَخْبَرْتُهُمْ فَكَأَنَّهُمْ أَنْكَرُوا ذَلِكَ فَقَامُوا بِأَجْمَعِهِمْ إِلَيْهَا فَقَالُوا إِنَّا بَعَثْنَا إِلَيْكِ هَذَا فِي كَذَا وَكَذَا وَذَكَرَ أَنَّكِ قُلْتِ كَذَا فَقَالَتْ صَدَقَ إِنَّ رَسُولَ اللَّهِ ﷺ أَكْثَرُ مَا كَانَ يَصُومُ مِنَ الْأَيَّامِ يَوْمُ السَّبْتِ وَالْأَحَدِ وَكَانَ يَقُولُ «إِنَّهُمَا عِيدَانِ لِلْمُشْرِكِينَ وَأَنَا أُرِيدُ أَنْ أُخَالِفَهُمْ»