Sahih Muslim 1131
صحيح مسلم#1131Sahihوَحَدَّثَنَاهُ أَحْمَدُ بْنُ الْمُنْذِرِ، حَدَّثَنَا حَمَّادُ بْنُ أُسَامَةَ، حَدَّثَنَا أَبُو الْعُمَيْسِ، أَخْبَرَنِي قَيْسٌ، فَذَكَرَ بِهَذَا الإِسْنَادِ مِثْلَهُ وَزَادَ قَالَ أَبُو أُسَامَةَ فَحَدَّثَنِي صَدَقَةُ بْنُ أَبِي عِمْرَانَ عَنْ قَيْسِ بْنِ مُسْلِمٍ عَنْ طَارِقِ بْنِ شِهَابٍ عَنْ أَبِي مُوسَى - رضى الله عنه - قَالَ كَانَ أَهْلُ خَيْبَرَ يَصُومُونَ يَوْمَ عَاشُورَاءَ يَتَّخِذُونَهُ عِيدًا وَيُلْبِسُونَ نِسَاءَهُمْ فِيهِ حُلِيَّهُمْ وَشَارَتَهُمْ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " فَصُومُوهُ أَنْتُمْ " .
Abu Musa reported that the people of Khaibar (most of them were Jews) observed fast on the day of 'Ashura and they treated it as 'Id and gave their women ornaments and beautiful dresses to wear. The Messenger of Allah (ﷺ) said:You (only) observe fast on this day
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
Sahih Muslim 1131 is the standard (Abd al-Baqi) number; this narration is #2661 in the MuslimGPT index.
In-book reference: 13:167