Fasting

Bukhari :: Book 3 :: Volume 31 :: Hadith 130

Narrated Abdullah bin Umar:

Allah's Apostle mentioned Ramadan and said, "Do not fast unless you see the crescent (of Ramadan), and do not give up fasting till you see the crescent (of Shawwal), but if the sky is overcast (if you cannot see it), then act on estimation (i.e. count Sha'ban as 30 days)."

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star