[Machine] The Messenger of Allah ﷺ was asked about fasting on the day of Ashura, and he said, "It expiates the sins of the previous year." He was also asked about fasting on the day of Arafah, and he said, "It expiates the sins of the previous year and the sins of the coming year." Abu Muhammad Abdullah Ibn Yahya Al-Sukkari from Baghdad told us that Ismail Al-Saffar narrated to us, and he was informed by Ahmad Ibn Mansur, who was informed by Abdul Razzaq, who was informed by Al-Thawri, who informed me, that Mujahid mentioned it.  

سُئِلَ رَسُولُ اللهِ ﷺ عَنْ صِيَامِ يَوْمِ عَاشُورَاءَ فَقَالَ يُكَفِّرُ السَّنَةَ وَسُئِلَ عَنْ صِيَامِ يَوْمِ عَرَفَةَ فَقَالَ يُكَفِّرُ سَنَتَيْنِ سَنَةً مَاضِيَةً وَسَنَةً مُسْتَقْبِلَةً أَخْبَرَنَاهُ أَبُو مُحَمَّدٍ عَبْدُ اللهِ بْنُ يَحْيَى السُّكَّرِيُّ بِبَغْدَادَ أنبأ إِسْمَاعِيلُ الصَّفَّارُ ثنا أَحْمَدُ بْنُ مَنْصُورٍ ثنا عَبْدُ الرَّزَّاقِ أنبأ الثَّوْرِيُّ أَخْبَرَنِي مَنْصُورٌ عَنْ مُجَاهِدٍ فَذَكَرَهُ