Narrated Sahl: The Prophet (peace be upon him) said, “There is a gate in Paradise called Ar-Raiyan, and those who observe fasts will enter through it on the Day of Resurrection and none except them will enter through it. It will be said, ‘Where are those who used to observe...

Narrated `Aisha: (the wife of the Prophet) Hamza bin `Amr Al-Aslami asked the Prophet (peace be upon him), “Should I fast while traveling?” The Prophet (peace be upon him) replied, “You may fast if you wish, and you may not fast if you wish.” Sahih al-Bukhari, Book...

Narrated Abu Huraira: The Prophet (peace be upon him) said,
“If somebody eats or drinks forgetfully then he should complete his fast, for what he has eaten or drunk, has been given to him by Allah.”
Sahih al-Bukhari, Book 30, Hadith 40

Narrated Abu Huraira: The Prophet (peace be upon him) said, “None of you should fast a day or two before the month of Ramadan unless he has the habit of fasting (Nawafil) (and if his fasting coincides with that day) then he can fast that day.” Sahih al-Bukhari, Book 30, Hadith...

Narrated `Abdullah: The Prophet (peace be upon him) fasted for days continuously; the people also did the same but it was difficult for them. So, the Prophet (peace be upon him) forbade them (to fast continuously for more than one day). They slid, “But you fast without break (no...