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:711-42b – Mujāhid
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السيوطي:٧١١-٤٢b –

"عَنْ مُجَاهِدٍ قَالَ: صِيَامُ عَرَفَةَ يَعْدِلُ سَنَةً قَبْلَهُ وَسَنَةً بَعْدَهُ".  

ابن جرير

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:2814 – al-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:٢٨١٤ – أَخْبَرَنَا 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»  

suyuti:699-22b – Ibrāhīm
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السيوطي:٦٩٩-٢٢b –

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

ابن جرير