ßÊÇÈ ÇáÕæã : Hadeeth No:1792 : 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)."...

ßÊÇÈ : Hadeeth No:1756 : 'Ali: We have nothing except the Book of Allah and this written paper from the Prophet (where-in is written:) Medina is a sanctuary from the 'Air Mountain to such and such a place, and whoever innovates in it an heresy or commits a sin, or gives shelter to such an innovator in it ...