It was narrated from Abu Dharr that the Prophet said to a man:
"You should fast the thirteenth, fourteenth and fifteenth." (Hasan) Abu 'Abdur-Rahman (An-Nasai) said: This is a mistake, it is not a narration of Bayan; perhaps Sufyan said: "It was narrated to us by two (Ithnan)" and the 'Alif was dropped so it became Bayan.
Reference: Sunan an-Nasa'i 2425 In-book : Book 22, Hadith 336 English translation : Vol. 3, Book 22, Hadith 2427
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