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, Book 31: Fasting, Hadith #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."
This hadith is from the book of Fasting in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 131 in book 31 of volume 3.
This hadith is referenced in the following topics: Rules of Fasting.
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