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.
ahmad:22616ʿAffān > Hammām > Suʾil ʿAṭāʾ b. Abū Rabāḥ > Shāhid

[Machine] This is from before you, O people of Iraq. Abu Al-Khaleel reported to me from Harmalah ibn Iyas, who reported from Abu Qatada that the Prophet ﷺ said, "A statement that resembles the righteousness of it is fasting on the Day of Arafah for two years, and fasting on the Day of Ashura for one year."  

أحمد:٢٢٦١٦حَدَّثَنَا عَفَّانُ حَدَّثَنَا هَمَّامٌ قَالَ سُئِلَ عَطَاءُ بْنُ أَبِي رَبَاحٍ وَأَنَا شَاهِدٌ عَنِ الْفَضْلِ فِي صَوْمِ يَوْمِ عَرَفَةَ فَقَالَ

جَاءَ هَذَا مِنْ قِبَلِكُمْ يَا أَهْلَ الْعِرَاقِ حَدَّثَنِيهِ أَبُو الْخَلِيلِ عَنْ حَرْمَلَةَ بْنِ إِيَاسٍ عَنْ أَبِي قَتَادَةَ أَنَّ النَّبِيَّ ﷺ قَالَ كَلِمَةً تُشْبِهُ عَدْلَ ذَلِكَ قَالَ صَوْمُ عَرَفَةَ بِصَوْمِ سَنَتَيْنِ وَصَوْمُ عَاشُورَاءَ بِصَوْمِ سَنَةٍ