"The Messenger of Allah said: The month may be twenty-nine days or it may be thirty. When you see it, then stop fasting, and it is obscured from you (too cloudy), then complete the count."'
Reference: Sunan an-Nasa'i 2138 In-book : Book 22, Hadith 49 English translation : Vol. 3, Book 22, Hadith 2140
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