حَدَّثَنَا أَبُو النُّعْمَانِ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ عَنْ عَمْرِو بْنِ دِينَارٍ وَعُبَيْدِ اللَّهِ بْنِ أَبِي يَزِيدَ قَالَا لَمْ يَکُنْ عَلَی عَهْدِ النَّبِيِّ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ حَوْلَ الْبَيْتِ حَائِطٌ کَانُوا يُصَلُّونَ حَوْلَ الْبَيْتِ حَتَّی کَانَ عُمَرُ فَبَنَی حَوْلَهُ حَائِطًا قَالَ عُبَيْدُ اللَّهِ جَدْرُهُ قَصِيرٌ فَبَنَاهُ ابْنُ الزُّبَيْرِ
صحیح بخاری · Hadith 3831
Narrated `Aisha: 'Ashura' (i.e. the tenth of Muharram) was a day on which the tribe of Quraish used to fast in the prelslamic period of ignorance. The Prophet also used to fast on this day. So when he migrated to Medina, he fasted on it and ordered (the Muslims) to fast on it. When the fasting of Ramadan was enjoined, it became optional for the people to fast or not to fast on the day of Ashura.
Sanad
3831 - حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، حَدَّثَنَا هِشَامٌ، قَالَ: حَدَّثَنِي أَبِي، عَنْ عَائِشَةَ، رَضِيَ اللَّهُ عَنْهَا،