"The messenger of Allah said: 'Do not fast one or two days ahead of the month, unless that happens to be a day that one of you habitually fasts."' Abu 'Abdur-Rahman (An-Nasai) said: This is a mistake. '
Reference: Sunan an-Nasa'i 2174 In-book : Book 22, Hadith 85 English translation : Vol. 3, Book 22, Hadith 2176
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