حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَی أَخْبَرَنَا ابْنُ وَهْبٍ أَخْبَرَنِي يُونُسُ عَنْ ابْنِ شِهَابٍ أَخْبَرَنِي عُرْوَةُ بْنُ الزُّبَيْرِ أَنَّ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ کَانَ رَسُولُ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ يَأْمُرُ بِصِيَامِهِ قَبْلَ أَنْ يُفْرَضَ رَمَضَانُ فَلَمَّا فُرِضَ رَمَضَانُ کَانَ مَنْ شَائَ صَامَ يَوْمَ عَاشُورَائَ وَمَنْ شَائَ أَفْطَرَ
صحیح مسلم · Hadith 2640
A'isha (Allah be pleased with her) reported. In the pre-Islamic days fast was observed on the day of Ashura, but with the advent of Islam (its position was ascertained as that of a voluntary fast). Then he who wished to fast fasted, and he who liked to abandon it abandoned it.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020