The Holy Prophet (peace and blessings of Allah be upon him) has given
guidance to the Muslims for each and every thing. He has given
detailed instructions on when to start the month of Ramadhan and how
to spend time during this month.
Beginning and Ending of Ramadhan: Hazrat Ibn Umar (may Allah be
pleased with him) has narrated that: "I heard the Holy Prophet
(peace and blessings of Allah be upon him) saying that you should
start fasting when you see the moon for the month of Ramadhan and
stop fasting when you see the new moon" (Sahih Bukhari,
Forgetfulness while fasting: The Holy Prophet (peace and
blessings of Allah be upon him) has said: "if some mistakenly eats
while fasting he should complete his fast till the evening because
surely Allah made him eat and drink" (Sahih Bukhari,
Importance of eating breakfast: Anas relates that the Holy
Prophet, peace be upon him, said: "Take breakfast before the fast
begins; there is blessing in breakfast" (Bokhari and Muslim), Zaid
ibn Thabit relates: We ate breakfast during Ramadhan with the Holy
Prophet, peace be upon him said: "The difference between our
observance of the fast and that of the People of the Book is eating
of breakfast" (Muslim).
Etiquettes of Sehri (food taken at dawn): Sehri is a blessed
meal. The Holy Prophet (peace and blessings of Allah be upon him)
has said: "This is truly a blessing. One strengthens in oneself the
habit of getting up early in the morning and to worship Allah and
one can offer humble prayers to Him." The Holy Prophet (peace and
blessings of Allah be upon him) also said: "Eat Sehri as there are
blessings in eating Sehri" (Sahih Bukhari, Kitab-ul-Saum).
At time of Iftar (opening the Fast): There are some times during
the day that are more helpful and assist in prayers being answered,
Allah accepts more prayers when the fast is opened. In one saying
the Holy Prophet (peace and blessings of Allah be upon him) has
reported to have said: "No prayer is rejected at the time of the
opening of the fast that is offered by someone who has been fasting"
(Sunan Ibn Maja, Al-Abwab Al-Dawat).