Arabic (Original)
حَدَّثَنَا إِسْمَاعِيلُ أَخْبَرَنَا أَيُّوبُ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّهُ قَالَ فِي عَاشُورَاءَ صَامَهُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَمَرَ بِصَوْمِهِ فَلَمَّا فُرِضَ رَمَضَانُ تُرِكَ فَكَانَ عَبْدُ اللَّهِ لَا يَصُومُهُ إِلَّا أَنْ يَأْتِيَ عَلَى صَوْمِهِ.
English Translation
Isma'il told us, Ayyub informed us, from Nafi', from Ibn Umar, who said regarding Ashura: The Messenger of Allah, peace and blessings be upon him, fasted it and commanded that it be fasted; but when Ramadan was made obligatory, it was left. So Abdullah would not fast it except when it coincided with his regular fasting.