Hadithcore
Sahih al-Bukhari, 1592
sahih

Narrated `Aisha:

The people used to fast on 'Ashura (the tenth day of the month of Muharram) before the fasting of Ramadan was made obligatory. And on that day the Ka`ba used to be covered with a cover. When Allah made the fasting of the month of Ramadan compulsory, Allah's Messenger (ﷺ) said, "Whoever wishes to fast (on the day of 'Ashura') may do so; and whoever wishes to leave it can do so."

حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ‏.‏ وَحَدَّثَنِي مُحَمَّدُ بْنُ مُقَاتِلٍ، قَالَ أَخْبَرَنِي عَبْدُ اللَّهِ ـ هُوَ ابْنُ الْمُبَارَكِ ـ قَالَ أَخْبَرَنَا مُحَمَّدُ بْنُ أَبِي حَفْصَةَ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ كَانُوا يَصُومُونَ عَاشُورَاءَ قَبْلَ أَنْ يُفْرَضَ رَمَضَانُ، وَكَانَ يَوْمًا تُسْتَرُ فِيهِ الْكَعْبَةُ، فَلَمَّا فَرَضَ اللَّهُ رَمَضَانَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏

‏ مَنْ شَاءَ أَنْ يَصُومَهُ فَلْيَصُمْهُ، وَمَنْ شَاءَ أَنْ يَتْرُكَهُ فَلْيَتْرُكْهُ ‏

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References2 variants
In-Book Reference
Book 25, Hadith 78
USC-MSA web (English) reference
Vol. 2, Book 26, Hadith 662 (deprecated numbering scheme)
Sharh · explanationclick to expand
The Jews used to fast on the day of ‘Aashooraa’, which is the tenth day of the month of Muharram, as a form of venerating the day in which Allah saved Prophet Moses (peace be upon him) from the clasps of Pharoah and of thanking Allah for this favour. The Prophet ﷺrecommended that Muslims fast the day, albeit with opposing the way Jews fast it by prescribing an additional fast of a day before it. The fast of the day of ‘Aashooraa’ underwent different phases of legislation. It is reported on the authority of ‘Aaishah (may Allah be pleased with her) that people used to fast on the day of ‘Aashooraa’ before Allah made the fasting of Ramadan obligatory upon them, and when He made the fasting of the month of Ramadan obligatory upon them in the second year of Hijrah, the Prophet ﷺmade it optional i.e., people have the choice either to fast it or forgo it. It has been mentioned concerning the virtue of its fast, that it expiates the sins of the year that has passed. It is reported in Saheeh Muslim that ‘Abdullah ibn ‘Abbaas (may Allah be pleased with him) related that the Sunnah is to fast the nineth day with it, for the purpose of opposing the Jews.” During the lifetime of the Prophet ﷺ, the ‘Ka’bah would be shrouded on this day i.e., they would shroud its stone bricks and wall with veils and fabrics. Quraysh was the one responsible for the task of shrouding it during that period because the Prophet ﷺthen was in al-Madeenah and he ﷺonly took control of the Ka’bah after the conquest of Makkah in the eighth year of the Hijrah. The Prophet ﷺconfirmed the practice of shrouding it on this day, which has been the practice of Muslims until today, despite the different timings for it. Nowadays, it is shrouded during the season of Hajj straight after the pilgrims making their way to the mount of ‘Arafaat. Its shrouding is among the exhibits of reverence and showing honour for the House of Allah. The statement of ‘Aaishah in the hadeeth that ‘They used to fast on ‘Aashooraa before Ramadan was made obligatory,’ benefits the possibility that fasting the day of ‘Aashooraa’ was compulsory and obligatory in nature, before Ramadan became mandatory, then the injunction was abrogated to the grade of desirability and recommendation. It was said that this was only an emphasis to fast and was not an obligatory injunction due to the agreed-upon hadeeth of Mu’aawiyah ibn Abee Sufyaan (may Allah be pleased with him) wherein the Prophet ﷺstated, “This is the day of ‘Aashooraa, Allah has not enjoined its fasting on you, but I am fasting it. You have the choice either to fast or not to fast (on this day).'.” From the benefits we can conclude from this hadeeth is learning about the significance of the day of ‘Aashooraa and the veneration of the Muslims for it..
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