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.
nasai-kubra:2814al-Qāsim b. Zakariyyā > Isḥāq b. Manṣūr > Sharīk > Manṣūr > Dhahabt > And Mujāhid > Abū al-Khalīl Fadhakar > Abū Qatādah

[Machine] On the authority of the Prophet ﷺ who said, "The fasting of Arafat is an expiation for the sins of the previous year and the coming year."  

الكبرى للنسائي:٢٨١٤أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا قَالَ حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ عَنْ شَرِيكٍ عَنْ مَنْصُورٍ قَالَ ذَهَبْتُ أنا وَمُجَاهِدٌ إِلَى أَبِي الْخَلِيلِ فَذَكَرَ عَنْ أَبِي قَتَادَةَ

عَنِ النَّبِيِّ ﷺ قَالَ «صِيَامُ عَرَفَةَ كَفَّارَةُ سَنَةٍ قَبْلَهُ وَسَنَةٍ بَعْدَهُ»  


See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:2813Mūsá 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:٢٨١٣أَخْبَرَنَا 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»  

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السيوطي:٦٩٩-٢٢b

"عَنْ إِبْرَاهِيمَ قَالَ: صِيَامُ يَوْمِ عَرَفَةَ يَعْدِلُ سَنَةً قَبْلَهُ وَسَنَةً بَعْدَهُ، وَصَوْمُ عَاشُوَراءَ كَفَّارَةُ سَنَة".  

ابن جرير