Arabic (Original)
حَدَّثَنَا ابْنُ نُمَيْرٍ أَخْبَرَنَا عُبَيْدُ اللَّهِ عَنْ نَافِعٍ قَالَ أَخْبَرَنِي ابْنُ عُمَرَ أَنَّ أَهْلَ الْجَاهِلِيَّةِ كَانُوا يَصُومُونَ يَوْمَ عَاشُورَاءَ وَأَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَامَهُ وَالْمُسْلِمُونَ قَبْلَ أَنْ يُفْتَرَضَ رَمَضَانُ فَلَمَّا افْتُرِضَ رَمَضَانُ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّ عَاشُورَاءَ يَوْمٌ مِنْ أَيَّامِ اللَّهِ تَعَالَى فَمَنْ شَاءَ صَامَهُ وَمَنْ شَاءَ تَرَكَهُ.
English Translation
Ibn Numayr told us; Ubaydullah informed us, from Nafi', who said: Ibn Umar informed me that the people of pre-Islamic ignorance used to fast on the day of Ashura, and that the Messenger of Allah, peace and blessings be upon him, fasted it, along with the Muslims, before Ramadan was made obligatory. When Ramadan was made obligatory, the Messenger of Allah, peace and blessings be upon him, said: "Ashura is one of the days of Allah the Exalted; whoever wishes may fast it, and whoever wishes may leave it."