Ibn 'Abbas said: When the Prophet (ﷺ) on the day of 'Ashurah and commanded us to fast on it, they (i.e. Companions) said: Messenger of Allah, this is a day which is considered great by Jews and Christians ? The Messenger of Allah (ﷺ) said: When the next year comes, we shall fast on the 9th of Muharram. But the next year the Messenger of Allah (ﷺ) breathed his last.

Ibn 'Abbas said: When the Prophet (ﷺ) on the day of 'Ashurah and commanded us to fast on it, they (i.e. Companions) said: Messenger of Allah, this is a day which is considered great by Jews and Christians ? The Messenger of Allah (ﷺ) said: When the next year comes, we shall fast on the 9th of Muharram. But the next year the Messenger of Allah (ﷺ) breathed his last.

حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ الْمَهْرِيُّ، حَدَّثَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يَحْيَى بْنُ أَيُّوبَ، أَنَّ إِسْمَاعِيلَ بْنَ أُمَيَّةَ الْقُرَشِيَّ، حَدَّثَهُ أَنَّهُ، سَمِعَ أَبَا غَطَفَانَ، يَقُولُ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ، يَقُولُ حِينَ صَامَ النَّبِيُّ صلى الله عليه وسلم يَوْمَ عَاشُورَاءَ وَأَمَرَنَا بِصِيَامِهِ قَالُوا يَا رَسُولَ اللَّهِ إِنَّهُ يَوْمٌ تُعَظِّمُهُ الْيَهُودُ وَالنَّصَارَى ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ فَإِذَا كَانَ الْعَامُ الْمُقْبِلُ صُمْنَا يَوْمَ التَّاسِعِ ‏"‏ ‏.‏ فَلَمْ يَأْتِ الْعَامُ الْمُقْبِلُ حَتَّى تُوُفِّيَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏.‏