Sahih Bukhari, Volume 3, Book31, Number 131

Narrated Abdullah bin Umar:
Allah’s Apostle said, “The month (can be) 29 nights (i.e. days), and do not fast till you see the moon, and if the sky is overcast, then complete Sha’ban as thirty days.”
Sahih Bukhari, Volume 3, Book31, Number 131

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