Sahih Bukhari 1903

Narrated Abu Huraira: Allah's Apostle said, Allah said, 'All the deeds of Adam's sons (people) are for them, except fasting which is for Me, and I will give the reward for it.' Fasting is a shield or protection from the fire and from committing..

Narrated 'Alqama: While I was walking with `Abdullah he said, We were in the company of the Prophet and he said, 'He who can afford to marry should marry, because it will help him refrain from looking at other women, and save his private parts..

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),..

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. ..

Narrated Ibn `Umar: The Prophet said, The month is like this and this, (at the same time he showed the fingers of both his hands thrice) and left out one thumb on the third time. ..

Narrated Abu Huraira: The Prophet or Abul-Qasim said, Start fasting on seeing the crescent (of Ramadan), and give up fasting on seeing the crescent (of Shawwal), and if the sky is overcast (and you cannot see it), complete thirty days of Sha'ban. ..