بُلُوغُ الْمَرَامِ
Bulugh al-Maram 686
Fasting
وَعَنْ أَبِي سَعِيدٍ اَلْخُدْرِيِّ - رضى الله عنه - { أَنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -نَهَى عَنْ صِيَامِ يَوْمَيْنِ: يَوْمِ اَلْفِطْرِ وَيَوْمِ اَلنَّحْرِ } مُتَّفَقٌ عَلَيْهِ [1] .
Abu Sa'id Al-Khudri (RAA) narrated. ‘The Messenger of Allah (ﷺ) has prohibited fasting on two days; the day of Fitr (breaking the fast of Ramadan) and on the day of sacrifice ('Idul Adha).’ Agreed upon.
Arabic/English book reference: Book 5, Hadith 706