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Narrated Ibn 'Umar:

The Prophet observed the fast on the 10th of Muharram ('Ashura), and ordered (Muslims) to fast on that day, but when the fasting of the month of Ramadan was prescribed, the fasting of the 'Ashura' was abandoned. 'Abdullah did not use to fast on that day unless it coincided with his routine fasting by chance.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا إِسْمَاعِيلُ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ صَامَ النَّبِيُّ صلى الله عليه وسلم عَاشُورَاءَ، وَأَمَرَ بِصِيَامِهِ‏.‏ فَلَمَّا فُرِضَ رَمَضَانُ تُرِكَ‏.‏ وَكَانَ عَبْدُ اللَّهِ لاَ يَصُومُهُ، إِلاَّ أَنْ يُوَافِقَ صَوْمَهُ‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 1892
• Sahih al-Bukhari, Vol. 3, Book of Fasting, Hadith 116
• Sahih al-Bukhari, Book of Fasting, Hadith 116