Abu 'Uthman reported from a man, that Abu Dharrr said:
"I heard the Messenger of Allah say: "Whoever fasts three days of each month has fasted the month in full' or 'will have (the reward of) fasting the month."' 'Asim was in doubt.
Reference: Sunan an-Nasa'i 2410 In-book : Book 22, Hadith 321 English translation : Vol. 3, Book 22, Hadith 2412
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