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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:21963a –
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السيوطي:٢١٩٦٣a –

"مَن صَامَ يَومَ عَرَفَةَ كَانَ لَهُ كَفَّارَةَ سَنَتَينِ".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:11081 – Muḥammad b. Ruzayq b. Jāmiʿ al-Miṣrī > al-Haytham b. Ḥabīb > Sallām al-Ṭawīl > Ḥamzah al-Zayyāt > Layth > Mujāhid > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Whoever fasts the Day of Arafah, it expiates for him the sins of two years."  

الطبراني:١١٠٨١ – حَدَّثَنَا مُحَمَّدُ بْنُ رُزَيْقِ بْنِ جَامِعٍ الْمِصْرِيُّ ثنا الْهَيْثَمُ بْنُ حَبِيبٍ ثنا سَلَّامُ الطَّوِيلُ عَنْ حَمْزَةَ الزَّيَّاتِ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ صَامَ يَوْمَ عَرَفَةَ كَانَ لَهُ كَفَّارَةَ سَنَتَيْنِ»