"I heard Abu Dharr, at Ar-Rabadhah, saying: 'The Messenger of Allah said: if you want to fast at any time during the monthm then fast on the thirteenth, fourteenth and fifteenth."'
Reference: Sunan an-Nasa'i 2424 In-book : Book 22, Hadith 335 English translation : Vol. 3, Book 22, Hadith 2426
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