Sunan Abi Dawud 2452
سنن أبي داود#2452Da'ifحَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، حَدَّثَنَا الْحَسَنُ بْنُ عُبَيْدِ اللَّهِ، عَنْ هُنَيْدَةَ الْخُزَاعِيِّ، عَنْ أُمِّهِ، قَالَتْ دَخَلْتُ عَلَى أُمِّ سَلَمَةَ فَسَأَلْتُهَا عَنِ الصِّيَامِ فَقَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَأْمُرُنِي أَنْ أَصُومَ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ أَوَّلُهَا الاِثْنَيْنِ وَالْخَمِيسِ .
Narrated Umm Salamah, Ummul Mu'minin: Hunaydah al-Khuza'i reported on the authority of her mother who said: I entered upon Umm Salamah and asked her about fasting. She said: The Messenger of Allah (ﷺ) used to command me to fast three days every month beginning with Monday or 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: 14:140