Riyad as-Salihin #548
The Book of Virtues
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعن أبي اليقظان عمار بن ياسر، رضي الله عنهما قال:
"من صام اليوم الذي يشك فيه فقد عصي أبا القاسم، صلى الله عليه وسلم" ((رواه أبو داود والترمذي وقال: حديث حسن صحيح)).
'Ammar bin Yasir (May Allah be pleased with them) reported: He who observes the fast on a doubtful day, has in fact disobeyed Abul-Qasim, (i.e., Messenger of Allah (ﷺ))..
Narrated by 'Ammar bin Yasir (May Allah be pleased with them) reported:
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About Riyad as-Salihin
This hadith is #548 from Riyad as-Salihin, in the Book of The Book of Virtues and narrated by 'Ammar bin Yasir (May Allah be pleased with them) reported:.