Quraish used to fast on the day of 'Ashura' in the Pre-Islamic period, and Messenger of Allah ﷺ too, used to fast on that day. When he came to Medina, he fasted on that day and ordered others to fast, too. Later when the fasting of the month of Ramadan was prescribed, he gave up fasting on the day of 'Ashura' and it became optional for one to fast on it or not.  

كَانَ يَوْمُ عَاشُورَاءَ تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ رَمَضَانُ تَرَكَ يَوْمَ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

'Ashura' (i.e. the tenth of Muharram) was a day on which the tribe of Quraish used to fast in the prelslamic period of ignorance. The Prophet ﷺ also used to fast on this day. So when he migrated to Medina, he fasted on it and ordered (the Muslims) to fast on it. When the fasting of Ramadan was enjoined, it became optional for the people to fast or not to fast on the day of Ashura.  

كَانَ عَاشُورَاءُ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ النَّبِيُّ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا نَزَلَ رَمَضَانُ كَانَ مَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ لاَ يَصُومُهُ  

Fasting was observed on the day of 'Ashura' (i.e. 10th of Muharram) by the people of the Pre-lslamic Period. But when (the order of compulsory fasting) in the month of Ramadan was revealed, the Prophet said, "It is up to one to fast on it (i.e. day of 'Ashura') or not."  

كَانَ عَاشُورَاءُ يَصُومُهُ أَهْلُ الْجَاهِلِيَّةِ فَلَمَّا نَزَلَ رَمَضَانُ قَالَ مَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ لَمْ يَصُمْهُ  

He who wishes to observe this fast may do so, and he who wishes to abandon it may do so.  

كَانَتْ قُرَيْشٌ تَصُومُ عَاشُورَاءَ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ فَلَمَّا هَاجَرَ إِلَى الْمَدِينَةِ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ شَهْرُ رَمَضَانَ قَالَ مَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

'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.  

أَنَّ يَوْمَ عَاشُورَاءَ كَانَ يُصَامُ فِي الْجَاهِلِيَّةِ فَلَمَّا جَاءَ الإِسْلاَمُ مَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

He who wishes to fast should do so, and he who wishes to break it may do so.  

أَنَّ قُرَيْشًا كَانَتْ تَصُومُ عَاشُورَاءَ فِي الْجَاهِلِيَّةِ ثُمَّ أَمَرَ رَسُولُ اللَّهِ ﷺ بِصِيَامِهِ حَتَّى فُرِضَ رَمَضَانُ فَقَالَ رَسُولُ اللَّهِ ﷺ مَنْ شَاءَ فَلْيَصُمْهُ وَمَنْ شَاءَ فَلْيُفْطِرْهُ  

'Ashura is one of the days of Allah, so he who wished should observe fast and he who wished otherwise should abandon it.  

أَنَّ أَهْلَ الْجَاهِلِيَّةِ كَانُوا يَصُومُونَ يَوْمَ عَاشُورَاءَ وَأَنَّ رَسُولَ اللَّهِ ﷺ صَامَهُ وَالْمُسْلِمُونَ قَبْلَ أَنْ يُفْتَرَضَ رَمَضَانُ فَلَمَّا افْتُرِضَ رَمَضَانُ قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ عَاشُورَاءَ يَوْمٌ مِنْ أَيَّامِ اللَّهِ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it.  

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ رَمَضَانُ كَانَ هُوَ الْفَرِيضَةَ وَتُرِكَ عَاشُورَاءُ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

"Ashura was a day that the Quraish used to fast during Jahiliyyah, and the Messenger of Allah used to fast it. But when (the fast of) Ramadan became obligatory, the Ramadan was the required and Ashura was left. So whoever wanted to, he fasted it, and whoever wanted to, he left it."  

كَانَ عَاشُورَاءُ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ النَّاسَ بِصِيَامِهِ فَلَمَّا افْتُرِضَ رَمَضَانُ كَانَ رَمَضَانُ هُوَ الْفَرِيضَةَ وَتَرَكَ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ وَفِي الْبَابِ عَنِ ابْنِ مَسْعُودٍ وَقَيْسِ بْنِ سَعْدٍ وَجَابِرِ بْنِ سَمُرَةَ وَابْنِ عُمَرَ وَمُعَاوِيَةَ  

Yahya related to me from Malik from Hisham ibn Urwa from his father that A'isha, the wife of the Prophet ﷺ said, "The day of Ashura was a day the Quraysh used to fast in the jahiliyya, and the Messenger of Allah ﷺ used also to fast it during the jahiliyya. Then when the Messenger of Allah ﷺ came to Madina he fasted it and ordered that it be fasted. Then Ramadan was made obligatory, and that became the fard instead of Ashura, but whoever wanted to, fasted it, and whoever did not want to, did not fast it."  

عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّهَا قَالَتْ كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللَّهِ ﷺ يَصُومُهُ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ رَمَضَانُ كَانَ هُوَ الْفَرِيضَةَ وَتُرِكَ يَوْمُ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا يَصُومُهُ رَسُولُ اللهِ ﷺ فِي الْجَاهِلِيَّةِ وَكَانَتْ قُرَيْشٌ تَصُومُهُ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ النَّبِيُّ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا نَزَلَ رَمَضَانُ كَانَ رَمَضَانُ هُوَ الْفَرِيضَةَ وَتَرَكَ عَاشُورَاءَ  

During the Pre-lslamic Period of ignorance the Quraish used to observe fasting on the day of 'Ashura', and the Prophet ﷺ himself used to observe fasting on it too. But when he came to Medina, he fasted on that day and ordered the Muslims to fast on it. When (the order of compulsory fasting in ) Ramadan was revealed, fasting in Ramadan became an obligation, and fasting on 'Ashura' was given up, and who ever wished to fast (on it) did so, and whoever did not wish to fast on it, did not fast. (Using translation from Bukhārī 4504)  

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللهِ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُوَأَمَرَ بِصِيَامِهِ فَلَمَّا نَزَلَ صَوْمُ رَمَضَانَ كَانَ رَمَضَانُ هُوَ الْفَرِيضَةَ وَتَرَكَ عَاشُورَاءَ فَكَانَ مَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ لَمْ يَصُمْهُ  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا يَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللهِ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا نَزَلَتْ فَرِيضَةُ شَهْرِ رَمَضَانَ كَانَ رَمَضَانُ هُوَ الَّذِي يَصُومُهُ وَتَرَكَ يَوْمَ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ أَفْطَرَهُ  

[Machine] The Messenger of Allah ﷺ said: "This is the day of Ashura, which the Quraysh used to fast during the time of ignorance. So whoever among you wishes to fast on this day, let them fast, and whoever wishes to abandon it, let them abandon it." Ibn Umar used to observe this fast except when it coincided with his own fast.  

قَالَ رَسُولُ اللَّهِ ﷺ «هَذَا يَوْمُ عَاشُورَاءَ كَانَتْ قُرَيْشٌ تَصُومُهُ فِي الْجَاهِلِيَّةِ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَصُومَهُ فَلْيَصُمْهُ فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يَتْرُكَهُ فَلْيَتْرُكْهُ» وَكَانَ ابْنُ عُمَرَ لَا يَصُومُهُ إِلَّا أَنْ يُوَافِقَ صِيَامَهُ  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

«كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ حَتَّى إِذَا فُرِضَ رَمَضَانُ كَانَ رَمَضَانُ هُوَ الْفَرِيضَةُ وَتُرِكَ يَوْمُ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ»  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

أَنَّهَا قَالَتْ «كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ رَمَضَانُ كَانَ هُوَ الْفَرِيضَةَ وَتُرِكَ يَوْمُ عَاشُورَاءَ فَمَنْ شَاءَ صَامَ وَمَنْ شَاءَ تَرَكَهُ»  

[Machine] The Messenger of Allah ﷺ mentioned the Day of Ashura and said, "The people of pre-Islamic ignorance used to observe fasting on this day, so whoever wishes may fast and whoever wishes may break his fast."  

ذَكَرَ رَسُولُ اللهِ ﷺ عَاشُورَاءَ فَقَالَ «كَانَ صَوْمَ أَهْلِ الْجَاهِلِيَّةِ فَمَنْ شَاءَ صَامَ وَمَنْ شَاءَ أَفْطَرَ»  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

«كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللهِ ﷺ يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَنَزَلَ صَوْمُ رَمَضَانَ فَكَانَ رَمَضَانُ هُوَ الْفَرِيضَةُ فَمَنْ شَاءَ صَامَ يَوْمَ عَاشُورَاءَ وَمَنْ شَاءَ تَرَكَ»  

The Quraish used to fast on the day of 'Ashurah in pre Islamic days. The Messenger of Allah ﷺ would fast on it in pre-Islamic period. When the Messenger of Allah ﷺ came to Medina, he fasted on it and commanded to fast on it. When the fast of Ramadan was prescribed, that became obligatory, and (fasting on) 'Ashurah was abandoned. He who wishes may fast on it and he who wishes may leave it. (Using translation from Abū Dāʾūd 2442)   

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ فَكَانَ رَسُولُ اللهِ ﷺ «يَصُومُهُ فَلَمَّا قَدِمَ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ» فَنَزَلَ صَوْمُ رَمَضَانَ فَكَانَ رَمَضَانُ هُوَ الْفَرِيضَةَ فَمَنْ شَاءَ صَامَ يَعْنِي عَاشُورَاءَ وَمَنْ شَاءَ تَرَكَ  

[Machine] The day of Ashura used to be observed as a fast by the Quraysh in the pre-Islamic era, and the Prophet Muhammad ﷺ also used to fast on this day during that time. When the Prophet Muhammad ﷺ arrived in Madinah, he continued to fast on this day and ordered others to also observe the fast. However, when the obligatory fast of Ramadan was established, it became the main priority, and the fast of Ashura was left as optional. So, whoever wishes to fast on this day may do so, and whoever wishes to leave it may do so.  

كَانَ يَوْمُ عَاشُورَاءَ يَوْمًا تَصُومُهُ قُرَيْشٌ فِي الْجَاهِلِيَّةِ وَكَانَ رَسُولُ اللهِ ﷺ يَصُومُهُ فِي الْجَاهِلِيَّةِ فَلَمَّا قَدِمَ رَسُولُ اللهِ ﷺ الْمَدِينَةَ صَامَهُ وَأَمَرَ بِصِيَامِهِ فَلَمَّا فُرِضَ رَمَضَانُ كَانَ هُوَ الْفَرِيضَةُ وَتَرَكَ يَوْمَ عَاشُورَاءَ فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ  

أنَّ أَهْلَ الْجَاهِلِيَّةِ كَانُوا يَصُومُونَ يَوْمَ عَاشُورَاءَ، وأَنَّ رَسُولَ الله ﷺ صَامَهُ، والْمُسْلِمُونَ قَبْلَ أَنْ يُفْتَرضَ رَمَضَانُ، فَلَمَّا افْتُرِضَ رَمَضَانُ قَالَ رَسُولُ الله ﷺ : إِنَّ عَاشُورَاءَ يَوْمٌ مِنْ أَيَّام الله فَمَنْ شَاءَ صَامَهُ، وَمَنْ شَاءَ تَرَكَهُ