سَأَلَ مُحَمَّدُ بْنُ مُسْلِمٍ وَ زُرَارَةُ بْنُ أَعْيَنَ أَبَا جَعْفَرٍ اَلْبَاقِرَ عَلَيْهِ اَلسَّلاَمُ: عَنْ صَوْمِ يَوْمِ عَاشُورَاءَ فَقَالَ «كَانَ صَوْمُهُ قَبْلَ شَهْرِ رَمَضَانَ فَلَمَّا نَزَلَ شَهْرُ رَمَضَانَ تُرِكَ ».
Muhammad ibn Muslim and Zurara ibn A‘yan asked Abu Ja‘far Imam Muhammad ibn Ali Al-Baqir (a.s) about fasting on the Day of Ashura. Imam (a.s) said: "Its fasting was practiced before the Month of Ramadan, but when the Month of Ramadan was prescribed, it was abandoned."