Virtue of Ramadan

When the month of Ramadan starts, the gates of the heaven are opened and the gates of Hell are closed and the devils are chained.
[Sahih Bukhari Volume 3, Book 31, Number 123]

Ramadan is a blessed month. In this month the Quran was revealed. In this month there is a night which is very virtuous, blessed and peaceful. This night is more virtuous then a thousand months.
[Surah Baqarah: ayah 185, Surah Dhukan: ayah 3, Surah Qadr, Nasai (Kitab ul Siyam) Sanad: Sahih]

Whoever established prayers on the night of Qadr out of sincere faith and hoping for a reward from Allah, then all his previous sins will be forgiven; and whoever fasts in the month of Ramadan out of sincere faith, and hoping for a reward from Allah, then all his previous sins will be forgiven.
[Sahih Bukhari: Volume 3, Book 31, Number 125]

Virtue of fasting

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.
[Sahih Bukhari: Volume 3, Book 31, Number 120]

Allah, the Majestic and the Exalted, said: Every act of the son of Adam (Alaihi Salaam) is for him except fasting. It is done for my sake, and I will give a reward for it. By Allah in Whose Hand is the life of Muhammad (SallAllah-u-Alaihi-wa-Sallam), the breath of the observer of fast is sweeter to Allah than the fragrance of musk.
[Sahih Muslim: Book 006, Number 2564]

Every servant of Allah who observes fast for a day in the way of Allah, Allah would remove because of this day, his face farther from the Fire (of Hell) to the extent of seventy years’ distance.
[Sahih Muslim: Book 006, Number 2730]

Rules and Regulations for Fasting

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.
[Sahih Bukhari: Volume 3, Book 31, Number 131]

Whoever does not give up forged speech and evil actions, Allah is not in need of his leaving his food and drink (i.e. Allah will not accept his fasting.)
[Sahih Bukhari: Volume 3, Book 31, Number 127]

If one of you is fasting, he should avoid quarreling, and if somebody should fight or quarrel with him, he should say, ‘I am fasting’.
[Sahih Bukhari: Volume 3, Book 31, Number 128]

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 Bukhari: Volume 3, Book 31, Number 138]

You can kiss your wife while fasting
[Sahih Bukhari: Volume 3, Book 31, Number 150]

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 Bukhari: Volume 3, Book 31, Number 154]

A person who breaks the fast in Ramadan should free a slave or observe fasts for two (consecutive) months or feed sixty poor persons.
[Sahih Muslim: Book 006, Number 2461]

If one has a sudden attack of vomiting while one is fasting, no atonement is required of him, but if he vomits intentionally he must make atonement.
[Abu Dawood, Tirmizi, also narrated in Sahih Jama ul Sagheer by Albani, Sanad: Sahih]

If during fasting a person vomits or has a wet dream, he still should complete his fast.
[Narrated by Abu Saeed, Dar Qutni (Kitab ul Siyam) Sanad Sahih]

Time for ending suhur is when the white streak becomes distinct from the dark streak for you.
[Surah Baqarah, ayah 187]

When the night approaches and the day retreats and the sun sinks down, then the observer of the fast should break it.
[Sahih Muslim: Book 006, Number 2421]

Uninterrupted fasting is forbidden.
[Sahih Muslim: Book 006, Number 2426]

The people will remain on the right path as long as they hasten the breaking of the fast.
[Sahih Bukhari: Volume 3, Book 31, Number 178]

Open your fast with dates, if it is not possible with dates then with water, dates is blessed and water purifies.
[Tirmizi (Kitab ul Zakat) and Abu Dawood (Kitab ul Saum), Sanad: Sahih]

No fasting is permissible on the two days of Id-ul-Fitr and ‘Id-ul-Adha.
[Sahih Bukhari: Volume 3, Book 31, Number 215]

The difference between our fasting and that of the people of the Book is eating shortly before dawn and the meal is blessed.
[Sahih Muslim: Book 006, Number 2412-2413]

There should be a time span of at least fifty verses between our Suhur and observing of salat.
[Sahih Muslim: Book 006, Number 2415]

A person can observe fast who is in a state of janabat (on account of intercourse) and the dawn breaks upon him.
[Sahih Muslim: Book 006, Number 2453]

During a journey a person can fast if likes and break it if likes.
[Sahih Muslim: Book 006, Number 2488]

To feed a person fasting to open his fast is righteous, the reward for it is the same as the person fasting while no reward is deducted from the person fasting.
[Tirmizi (Kitab ul Saum), Imam Tirmizi declared this hadith Sahih]

To eat near a person fasting is allowed, till the eating of food is done near the person fasting Angels will keep praying for blessing for the person.
[Tirmizi (Kitab ul Saum), Imam Tirmizi declared this hadith Sahih]

Supplications for fasting

Zahabaz zamaao wabtalateyl urooko wa sabat al ajro InshAllah.
[Tirmizi (Kitab ul Zakat) and Abu Dawood (Kitab ul Saum) Sanad: Sahih]

The above supplication is for opening fast while the other narrated by almost everyone is:

Allahumma ini laka sumtu wabika amuntu wo elieka tawakkaltu wa ala rizkeyka aftartu.

We are yet to find these words in any hadith whether in a Sahih, dhaeef or moudhou hadith.

If any one knows from where this has originated, please do let us know, there are some words similar to it found in a hadith in Abu Dawood but it is Mursal dhaeef.

Note: VERBAL DECLARATION OF KEEPING FAST IS BIDAH