Sahih Muslim Book - 13, Hadith - 2648

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ وَأَبُو كُرَيْبٍ جَمِيعًا عَنْ أَبِى مُعَاوِيَةَ قَالَ أَبُو بَكْرٍ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ عَنْ عُمَارَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ قَالَ دَخَلَ الأَشْعَثُ بْنُ قَيْسٍ عَلَى عَبْدِ اللَّهِ وَهُوَ يَتَغَدَّى فَقَالَ يَا أَبَا مُحَمَّدٍ ادْنُ إِلَى الْغَدَاءِ. فَقَالَ أَوَلَيْسَ الْيَوْمُ يَوْمَ عَاشُورَاءَ قَالَ وَهَلْ تَدْرِى مَا يَوْمُ عَاشُورَاءَ قَالَ وَمَا هُوَ قَالَ إِنَّمَا هُوَ يَوْمٌ كَانَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- يَصُومُهُ قَبْلَ أَنْ يَنْزِلَ شَهْرُ رَمَضَانَ فَلَمَّا نَزَلَ شَهْرُ رَمَضَانَ تُرِكَ. وَقَالَ أَبُو كُرَيْبٍ تَرَكَهُ.

It was narrated that Abdur-Rehman bin Yazid said: “Al-Ashath bin Qais entered upon Abdullah when he was eating his lunch. He said: ‘O Abu Muhammad, come and eat.’ He said: ‘isn’t today Ashura?’ He said: ‘Do you know what the day of Ashura is?’ He said: ‘What is it?’ He said: ‘It is a day that the Messenger of Allah (SAW) used to fast before (fasting during) the month of Ramadan was enjoined, it was abandoned. ’” Abu Kuraib said: “He abandoned it.”