Hadith
Riyad as-Salihin #546
The Book of Virtues· كتاب الفضائل
riyad_as_salihin:546وعن ابن عباس رضي الله عنهما قال: قال رسول الله صلى الله عليه وسلم " لا تصوموا قبل رمضان صوموا لرؤيته وأفطروا لرؤيته، فإن حالت دونه فأكملوا ثلاثين يومًا" ((رواه الترمذي وقال حديث حسن صحيح.
The Messenger of Allah (ﷺ) said, "Do not observe Saum (fasting) before the advent of Ramadan. Observe Saum at sighting of the crescent of Ramadan and terminate it at sighting the crescent (of Shawwal). If the sky is overcast, complete (the month as) thirty (days).".
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