Sunan an-Nasa'i 2417
سنن النسائي#2417Sahihأَخْبَرَنِي أَحْمَدُ بْنُ يَحْيَى، عَنْ أَبِي نُعَيْمٍ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنِ الْحُرِّ بْنِ الصَّيَّاحِ، عَنْ هُنَيْدَةَ بْنِ خَالِدٍ، عَنِ امْرَأَتِهِ، عَنْ بَعْضِ، أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَصُومُ تِسْعًا مِنْ ذِي الْحِجَّةِ وَيَوْمَ عَاشُورَاءَ وَثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ أَوَّلَ اثْنَيْنِ مِنَ الشَّهْرِ وَخَمِيسَيْنِ .
It was narrated from Hunaidah bin Khalid, from his wife, from one of the wives of the Prophet, that:the Messenger of Allah used to fast nine days of Dhul-Hijjah, the day of 'Ashura', and three days of each month: The first Monday of the month, and two Thursday
Scholarly Authentication
The label above is the grade most of these scholars gave — 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. Each scholar's own wording:
In-book reference: 22:328