:عَنْ أَبِي قَتَادَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ
صِيَامُ يَوْمِ عَرَفَةَ إِنِّي أَحْتَسِبُ عَلَى اللَّهِ أَنْ يُكَفِّرَ السَّنَةَ الَّتِي قَبْلَهُ وَالسَّنَةَ الَّتِي بَعْدَهُ
Hazrat Abu Qatadah Radiallahu Anhu narrated that
Rasulullah Sallallahu Alaihi Wasallam said:
“Fast on the Day of Arafah (9th of Zulhijjah), for indeed I anticipate that Allah will forgive (one’s minor sins) of the year after it, and the year before it.”
~ Tirmidhi