When al-Ash'ath b. Qais entered the house of 'Abdullah he was having his breakfast. He ('Abdullah b. Umar) said: Abd Muhammad (al-Asha'th), come near to the breakfast. Thereupon he said: Is not today the day of 'Ashura? He ('Abd al-Rahman) said: Do you know what the day of 'Ashura is? He said: What is it? He said: It is a day on which the Messenger of Allah ﷺ used to observe fast before the (fasting) in the month of Ramadan (became) obligatory. But when it became obligatory the (fasting of 'Ashura) was abandoned (as compulsory). Abu Kuraib said: He (the Holy Prophet) abandoned it.  

يَا أَبَا مُحَمَّدٍ ادْنُ إِلَى الْغَدَاءِ فَقَالَ أَوَلَيْسَ الْيَوْمُ يَوْمَ عَاشُورَاءَ قَالَ وَهَلْ تَدْرِي مَا يَوْمُ عَاشُورَاءَ قَالَ وَمَا هُوَ قَالَ إِنَّمَا هُوَ يَوْمٌ كَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ قَبْلَ أَنْ يَنْزِلَ شَهْرُ رَمَضَانَ فَلَمَّا نَزَلَ شَهْرُ رَمَضَانَ تُرِكَ وَقَالَ أَبُو كُرَيْبٍ تَرَكَهُ  

[Machine] "Do you not come closer, O Abu Muhammad, to lunch?" He said, "Why did you fast today?" He said, "We used to fast this day before Ramadan came down. So when Ramadan came down, we fasted it and left everything else."  

أَلَا تَدْنُو يَا أَبَا مُحَمَّدٍ إِلَى الْغَدَاءِ؟ قَالَ وَمَا صُمْتُمْ هَذَا الْيَوْمَ؟ قَالَ «إِنَّ هَذَا الْيَوْمَ كُنَّا نَصُومُهُ قَبْلَ أَنْ يَنْزِلَ رَمَضَانُ فَلَمَّا نَزَلَ رَمَضَانُ صُمْنَاهُ وَتَرَكْنَا مَا سِوَاهُ»