Narrated Ibn `Umar:
I heard Allah's Messenger (ﷺ) saying, "When you see the crescent (of the month of Ramadan), start fasting, and when you see the crescent (of the month of Shawwal), stop fasting; and if the sky is overcast (and you can't see it) then regard the month of Ramadan as of 30 days."
Reference | : Sahih al-Bukhari 1900 |
In-book reference | : Book 30, Hadith 10 |
USC-MSA web (English) reference | : Vol. 3, Book 31, Hadith 124 |
(deprecated numbering scheme) |