Al-Hakam b. al-A'raj said: I came to Ibn 'Abbas who was leaning against his sheet of cloth in the Sacred Mosque (al-Masjid al-Haram). I asked him about fasting on the day of 'Ashurah. He said: When you sight the moon of al-Muharram, count (the days). When the 9th of Muharram comes, fast from the morning. I said: Would Muhammad (ﷺ) observe this fast ? He replied: Thus Muhammad (ﷺ) used to fast.

Al-Hakam b. al-A'raj said: I came to Ibn 'Abbas who was leaning against his sheet of cloth in the Sacred Mosque (al-Masjid al-Haram). I asked him about fasting on the day of 'Ashurah. He said: When you sight the moon of al-Muharram, count (the days). When the 9th of Muharram comes, fast from the morning. I said: Would Muhammad (ﷺ) observe this fast ? He replied: Thus Muhammad (ﷺ) used to fast.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، - يَعْنِي ابْنَ سَعِيدٍ - عَنْ مُعَاوِيَةَ بْنِ غَلاَبٍ، ح وَحَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا إِسْمَاعِيلُ، أَخْبَرَنِي حَاجِبُ بْنُ عُمَرَ، - جَمِيعًا الْمَعْنَى - عَنِ الْحَكَمِ بْنِ الأَعْرَجِ، قَالَ أَتَيْتُ ابْنَ عَبَّاسٍ وَهُوَ مُتَوَسِّدٌ رِدَاءَهُ فِي الْمَسْجِدِ الْحَرَامِ فَسَأَلْتُهُ عَنْ صَوْمِ يَوْمِ عَاشُورَاءَ فَقَالَ إِذَا رَأَيْتَ هِلاَلَ الْمُحَرَّمِ فَاعْدُدْ فَإِذَا كَانَ يَوْمُ التَّاسِعِ فَأَصْبِحْ صَائِمًا ‏.‏ فَقُلْتُ كَذَا كَانَ مُحَمَّدٌ صلى الله عليه وسلم يَصُومُ فَقَالَ كَذَلِكَ كَانَ مُحَمَّدٌ صلى الله عليه وسلم يَصُومُ ‏.‏