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Bulugh al-Maramوَعَنْ عَمَّارِ بْنِ يَاسِرٍ - رضى الله عنه - قَالَ: { مَنْ صَامَ اَلْيَوْمَ اَلَّذِي يُشَكُّ فِيهِ فَقَدْ عَصَى أَبَا اَلْقَاسِمِ - صلى الله عليه وسلم -} وَذَكَرَهُ اَلْبُخَارِيُّ تَعْلِيقًا, وَوَصَلَهُ اَلْخَمْسَةُ, وَصَحَّحَهُ اِبْنُ خُزَيْمَةَ, وَابْنُ حِبَّانَ 1 .
Ammar bin Yasir (RAA) narrated, "Whoever fasts the day of doubt he has then disobeyed Abu al-Qasim (the Prophet).' Related by the five Imams, and Ibn Khuzaimah and Ibn Hibban graded it as Sahih
Reference: English : Book 5, Hadith 672
Arabic : Book 5, Hadith 651
Arabic : Book 5, Hadith 651