Jami at-Tirmidhi 754
Jami at-Tirmidhi · Book 8: The Book on Fasting · What Has Been Related About Which Day Ashura Is
Al-Hakam bin Al-Arfaj said:
حَدَّثَنَا هَنَّادٌ ، وَأَبُو كُرَيْبٍ قَالاَ حَدَّثَنَا وَكِيعٌ ، عَنْ حَاجِبِ بْنِ عُمَرَ ، عَنِ الْحَكَمِ بْنِ الأَعْرَجِ ، قَالَ انْتَهَيْتُ إِلَى ابْنِ عَبَّاسٍ وَهُوَ مُتَوَسِّدٌ رِدَاءَهُ فِي زَمْزَمَ فَقُلْتُ أَخْبِرْنِي عَنْ يَوْمِ عَاشُورَاءَ أَىُّ يَوْمٍ هُوَ أَصُومُهُ فَقَالَ إِذَا رَأَيْتَ هِلاَلَ الْمُحَرَّمِ فَاعْدُدْ ثُمَّ أَصْبِحْ مِنَ التَّاسِعِ صَائِمًا . قَالَ فَقُلْتُ أَهَكَذَا كَانَ يَصُومُهُ مُحَمَّدٌ صلى الله عليه وسلم قَالَ نَعَمْ .
"I met up with Ibn Abbas while he was reclining on his Rida at the Zamzam (well). So I said: 'Inform me about the Day of Ashura. On which day is it fasted?' He said: 'When you see the crescent of Al-Muharram, then count, then fast on the morning of the ninth day.'" He said: 'I said: Is this how Muhammad fasted it?' He said: 'Yes.'"
Grade: Sahih (Darussalam)