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If (the sky) is cloudy for you, then calculate thirty days (for the month of Ramadan).
Sahih Muslim Book 13, Hadith 6
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The month is thus and thus. (He then withdrew his thumb at the third time). He then said: Fast when you see it, and break your fast when you see it, and if the weather is cloudy calculate it (the months of Sha'ban and Shawwal) as thirty days.
Sahih Muslim Book 13, Hadith 5
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The month may consist of twenty-nine days, and it may be thus, thus and thus, and (he further) said: Calculate it, but he did not say thirty.
Sahih Muslim Book 13, Hadith 7