Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:23654a –
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السيوطي:٢٣٦٥٤a –

"مِنْ كُلِّ شَهْرٍ ثَلاثةُ أَيَّامٍ، مَن اسْتَطَاعَ أَنْ يَصُومَهُنَّ فَإِنَّ كُلَّ يومٍ يُكَفِّرُ عَشْرَ سيَئّاتٍ، وَأَنَّه يُنَقِّي من الإِثْمِ كما يُنَقِّي المَاءُ الثَّوبَ".  

[طب] الطبرانى في الكبير عن ميمونة بنت سعد

See similar narrations below:

Collected by Ṭabarānī
tabarani:21621 – Aḥmad b. al-Naḍr al-ʿAskarī > Isḥāq b. Zurayq al-Rāsibī

[Machine] She said: "O Messenger of Allah, advise us about fasting." He said: "From every month, fast three days, for whoever can fast them. For indeed, every day will expiate ten evil deeds, and it cleanses from sin as water cleanses a garment."  

الطبراني:٢١٦٢١ – حَدَّثَنَا أَحْمَدُ بْنُ النَّضْرِ الْعَسْكَرِيُّ ثنا إِسْحَاقُ بْنُ زُرَيْقٍ الرَّاسِبِيُّ ثنا عُثْمَانُ بْنُ عَبْدِ الرَّحْمَنِ الطَّرَائِفِيُّ ثنا عَبْدُ الْحَمِيدِ بْنُ يَزِيدَ عَنْ آمِنَةَ بِنْتِ عُمَرَ بْنِ عَبْدِ الْعَزِيزِ عَنْ مَيْمُونَةَ بِنْتِ سَعْدٍ

أَنَّهَا قَالَتْ يَا رَسُولَ اللهِ أَفْتِنَا عَنِ الصَّوْمِ فَقَالَ «مِنْ كُلِّ شَهْرٍ ثَلَاثَةُ أَيَّامٍ مَنِ اسْتَطَاعَ أَنْ يَصُومَهُنَّ فَإِنَّ كُلَّ يَوْمٍ يُكَفِّرُ عَشْرَ سَيِّئَاتٍ وَإِنَّهُ يُنَقِّي مِنَ الْإِثْمِ كَمَا يُنَقِّي الْمَاءُ الثَّوْبَ»