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
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السيوطي:١٥٢٠٥a –

"صَوْمُ يَوم التروية كفَّارَةُ سَنَةٍ، وَصَوْمُ يَوْم عَرَفة كَفَّارَةُ سَنَتَينِ".  

أبو الشيخ، وابن النجار عن ابن عباس

See similar narrations below:

Collected by Aḥmad, Nasāʾī's Kubrá, Bayhaqī, Suyūṭī
ahmad:22588 – ʿAbd al-Razzāq > Sufyān > Manṣūr > Mujāhid > Ḥarmalah b. Iyās al-Shaybāniyyiʿan Abū Qatādah

[Machine] The Prophet ﷺ said: "Fasting the day of Arafat expiates the sins of the previous year and the coming year, and fasting the day of Ashura expiates the sins of a year."  

أحمد:٢٢٥٨٨ – حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا سُفْيَانُ عَنْ مَنْصُورٍ عَنْ مُجَاهِدٍ عَنْ حَرْمَلَةَ بْنِ إِيَاسٍ الشَّيْبَانِيِّعَنْ أَبِي قَتَادَةَ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ صَوْمُ يَوْمِ عَرَفَةَ كَفَّارَةُ سَنَتَيْنِ سَنَةٍ مَاضِيَةٍ وَسَنَةٍ مُسْتَقْبَلَةٍ وَصَوْمُ يَوْمِ عَاشُورَاءَ كَفَّارَةُ سَنَةٍ  

nasai-kubra:2813 – Mūsá b. ʿAbd al-Raḥman al-Masrūqī al-Kūfī > Ḥusayn b. ʿAlī al-Juʿfī > Zāʾidah > Manṣūr > Abū al-Khalīl > Iyās b. Ḥarmalah al-Sadūsī > Abū Qatādah

[Machine] The Messenger of Allah ﷺ said, "Fasting on the day of Arafah expiates the sins of the previous year and the coming year, and fasting on the day of Ashura expiates the sins of one year."  

الكبرى للنسائي:٢٨١٣ – أَخْبَرَنَا مُوسَى بْنُ عَبْدِ الرَّحْمَنِ الْمَسْرُوقِيُّ الْكُوفِيُّ قَالَ حَدَّثَنَا حُسَيْنُ بْنُ عَلِيٍّ الْجُعْفِيُّ عَنْ زَائِدَةَ عَنْ مَنْصُورٍ عَنْ أَبِي الْخَلِيلِ عَنْ إِيَاسِ بْنِ حَرْمَلَةَ السَّدُوسِيِّ عَنْ أَبِي قَتَادَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «صَوْمُ يَوْمِ عَرَفَةَ كَفَّارَةُ سَنَتَيْنِ سَنَةٍ قَبْلَهُ وَسَنَةٍ بَعْدَهُ وَصَوْمُ يَوْمِ عَاشُورَاءَ كَفَّارَةُ سَنَةٍ»  

bayhaqi:8381 – Abū al-Ḥusayn Muḥammad b. al-Ḥusayn b. Muḥammad b. al-Faḍl al-Qaṭṭān> Abū ʿAlī Ismāʿīl b. Muḥammad al-Ṣaffār > ʿAbdullāh b. Ayyūb al-Makhramī > Sufyān b. ʿUyaynah > Dāwud b. Shābūr > Abū Qazaʿah > Abū al-Khalīl > Abū Ḥarmalah > Abū Qatādah

[Machine] The Prophet ﷺ said: The fasting of the Day of Arafah is an expiation for the sins of the previous year and the coming year, and the fasting of the Day of Ashura is an expiation for the sins of the previous year.  

البيهقي:٨٣٨١ – أَخْبَرَنَا أَبُو الْحُسَيْنِ مُحَمَّدُ بْنُ الْحُسَيْنِ بْنِ مُحَمَّدِ بْنِ الْفَضْلِ الْقَطَّانُ بِبَغْدَادَ ثنا أَبُو عَلِيٍّ إِسْمَاعِيلُ بْنُ مُحَمَّدٍ الصَّفَّارُ ثنا عَبْدُ اللهِ بْنُ أَيُّوبَ الْمَخْرَمِيُّ ثنا سُفْيَانُ بْنُ عُيَيْنَةَ عَنْ دَاوُدَ بْنِ شَابُورَ عَنْ أَبِي قَزَعَةَ عَنْ أَبِي الْخَلِيلِ عَنْ أَبِي حَرْمَلَةَ عَنْ أَبِي قَتَادَةَ يَبْلُغُ بِهِ

النَّبِيَّ ﷺ صَوْمُ يَوْمِ عَرَفَةَ كَفَّارَةُ سَنَةٍ وَالَّتِي تَلِيهَا وَصَوْمُ يَوْمِ عَاشُورَاءَ كَفَّارَةُ سَنَةٍ