Allah's Apostle ordered (the Muslims) to fast on the day of 'Ashura', and when fasting in the month of Ramadan was prescribed, it became optional for one to fast on that day ('Ashura') or not.

The news of my fasting was mentioned to the Prophet . So he entered upon me and I put for him a leather cushion stuffed with palm-fibres. The Prophet sat on the floor and the cushion was between me and him. He said to me, "Isn't it sufficient for you (that you fast) three days a month?" I said, "O Allah's Apostle! (I can fast more than this)." He said, "You may fast) five days a month." I said, "O Allah's Apostle! (I can fast more than this)." He said, "(You may fast) seven days." I said, "O Allah's Apostle!" He said, "Nine." I said, "O Allah's Apostle!" He said, "Eleven." I said, "O Allah's Apostle!" He said, "No fasting is superior to the fasting of (the Prophet David) which was one half of a year, and he used, to fast on alternate days. (See Hadith No. 300, Vol 3)

Allah's Apostle said to me, "O `Abdullah! Have I not been informed that you fast during the day and offer prayers all the night." `Abdullah replied, "Yes, O Allah's Apostle!" The Prophet said, "Don't do that; fast for few days and then give it up for few days, offer prayers and also sleep at night, as your body has a right on you, and your wife has a right on you, and your guest has a right on you. And it is sufficient for you to fast three days in a month, as the reward of a good deed is multiplied ten times, so it will be like fasting throughout the year." I insisted (on fasting) and so I was given a hard instruction. I said, "O Allah's Apostle! I have power." The Prophet said, "Fast like the fasting of the Prophet David and do not fast more than that." I said, "How was the fasting of the Prophet of Allah, David?" He said, "Half of the year," (i.e. he used to fast on every alternate day). Afterwards when `Abdullah became old, he used to say, "It would have been better for me if I had accepted the permission of the Prophet (which he gave me i.e. to fast only three days a month).

The Prophet (saws) said: Do not fast one day or two days just before Ramadan except in the case of a man who has been in the habit or observing a fast (on that day); and do not fast until you sight it (the moon). Then fast until you sight it. If a cloud appears on that day (i.e. 29th of Ramadan) then complete the number thirty (days) and then end the fasting: a month consists of twenty-nine days.

Allah's Apostle said, "Fasting is a shield (or a screen or a shelter). So, the person observing fasting should avoid sexual relation with his wife and should not behave foolishly and impudently, and if somebody fights with him or abuses him, he should tell him twice, 'I am fasting." The Prophet added, "By Him in Whose Hands my soul is, the smell coming out from the mouth of a fasting person is better in the sight of Allah than the smell of musk. (Allah says about the fasting person), 'He has left his food, drink and desires for My sake. The fast is for Me. So I will reward (the fasting person) for it and the reward of good deeds is multiplied ten times."

'A'isha, the Mother of the Believers (Allah be pleased with her), reported that the Messenger of Allah (may peace be upon him) used to fast (so continuously) that we said that he would not break, and did not fast at all till we said that he would not fast. And I did not see the Messenger of Allah (may peace be upon him) completing the fast of a month, but that of Ramadan, and I did not see him fasting more in any other month than that of Sha'ban.

The Prophet visited her (Juwairiya) on a Friday and she was fasting. He asked her, "Did you fast yesterday?" She said, "No." He said, "Do you intend to fast tomorrow?" She said, "No." He said, "Then break your fast." Through another series of narrators, Abu Aiyub is reported to have said, "He ordered her and she broke her fast."

Ibn `Abbas said, "Allah's Apostle travelled in the month of Ramadan and he fasted till he reached (a place called) 'Usfan, then he asked for a tumbler of water and drank it by the daytime so that the people might see him. He broke his fast till he reached Mecca." Ibn `Abbas used to say, "Allah's Apostle fasted and sometimes did not fast while traveling, so one may fast or may not (on journeys)"

Yahya related to me from Malik from Hisham ibn Urwa that his father used to be cupped while he was fasting and he would not then break his fast. Hisham added, "I only ever saw him being cupped when he was fasting."

Malik said, "Cupping is only disapproved of for some one who is fasting out of fear that he will become weak and if it were not for that, it would not be disapproved of. I do not think that a man who is cupped in Ramadan and does not break his fast, owes anything, and I do not say that he has to make up for the day on which he was cupped, because cupping is only disapproved of for someone fasting if his fast is endangered. I do not think that someone who is cupped, and is then well enough to keep the fast until evening, owes anything, nor does he have to make up for that day."

Yahya said that he heard Malik say, "What I have heard from the people of knowledge is that if a man succumbs to an illness which makes fasting very difficult for him and exhausts him and wears him out, he can break his fast. This is the same as with a sick man in the prayer, who finds standing to be too difficult and exhausting, (and Allah knows better than the slave that it is an excuse for him and that it really cannot be described). If the man is in such a condition he prays sitting, and the deen of Allah is ease.

Allah has permitted a traveller to break the fast when travelling, and he has more strength for fasting than a sick man. Allah, the Exalted, says in His book, 'Whoever among you is ill or on a journey (must fast) a number of other days,' and Allah has thus permitted a traveller to break his fast when on a journey, and he is more capable of fasting than a sick man.

Allah's Apostle was informed about my fasts, and he came to me and I spread for him a leather cushion stuffed with palm fires, but he sat on the ground and the cushion remained between me and him, and then he said, "Isn't it sufficient for you to fast three days a month?" I replied, "O Allah's Apostle! (I can fast more)." He said, "Five?" I replied, "O Allah's Apostle! (I can fast more)." He said, "Seven?" I replied, "O Allah's Apostle! (I can fast more)." He said, "Nine (days per month)?" I replied, "O Allah's Apostle! (I can fast more)" He said, "Eleven (days per month)?" And then the Prophet said, "There is no fast superior to that of the Prophet David it was for half of the year. So, fast on alternate days."

Yahya related to me from Malik from Hisham ibn Urwa from his father that A'isha, the wife of the Prophet, may Allah bless him and grant him peace, said, "The day of Ashura was a day the Quraysh used to fast in the jahiliyya, and the Messenger of Allah, may Allah bless him and grant him peace, used also to fast it during the jahiliyya. Then when the Messenger of Allah, may Allah bless him and grant him peace, came to Madina he fasted it and ordered that it be fasted. Then Ramadan was made obligatory, and that became the fard instead of Ashura, but whoever wanted to, fasted it, and whoever did not want to, did not fast it."

That Al-Ash'ath entered upon him while he was eating. Al-Ash'ath said, "Today is 'Ashura." I said (to him), "Fasting had been observed (on such a day) before (the order of compulsory fasting in) Ramadan was revealed. But when (the order of fasting in) Ramadan was revealed, fasting (on 'Ashura') was given up, so come and eat."

Yahya related to me from Malik from Hisham ibn Urwa from his father that Hamza ibn Amr al-Aslami once said to the Messenger of Allah, may Allah bless him and grant him peace, "Messenger of Allah, I am a man who fasts. Can I fast when travelling?" The Messenger of Allah, may Allah bless him and grant him peace, said, "If you want you can fast, and if you want you can break the fast."

Some food was presented to me and Hafsah. We were fasting, but broke our fast. Then the Messenger of Allah (saws) entered upon us. We said to him: A gift was presented to us; we coveted it and we broke our fast. The Messenger of Allah (saws) said: There is no harm to you; keep a fast another day in lieu of it.

The people used to fast on 'Ashura (the tenth day of the month of Muharram) before the fasting of Ramadan was made obligatory. And on that day the Ka`ba used to be covered with a cover. When Allah made the fasting of the month of Ramadan compulsory, Allah's Apostle said, "Whoever wishes to fast (on the day of 'Ashura') may do so; and whoever wishes to leave it can do so."

The Prophet of Allah (saws) used to say when he broke his fast: O Allah, for Thee I have fasted, and with Thy provision I have broken my fast.

Yahya related to me from Malik that he had heard that once in the time of Uthman ibn Affan the new moon had been seen in the afternoon and Uthman did not break his fast until evening had come and the sun had set.

Yahya said that he had heard Malik say that some one who sees the new moon of Ramadan when he is on his own should start the fast and not break it if he knows that that day is part of Ramadan. He added, "Some one who sees the new moon of Shawwal when he is on his own does not break the fast, because people suspect the reliability of someone among them who breaks the fast. Such people should say, when they sight the new moon, 'We have seen the new moon.' Whoever sees the new moon of Shawwal during the day should not break his fast but should continue fasting for the rest of that day. This is because it is really the new moon of the night that is coming ."

Yahya said that he heard Malik say, "If people are fasting on the day of Fitr thinking that it is still Ramadan and then definite evidence comes to them that the new moon of Ramadan had been seen one day before they began to fast and that they are now into the thirty- first day, then they should break the fast on that day at whatever time the news comes to them. However, they do not pray the id prayer if they hear the news after the sun has begun to decline."

(the wife of the Prophet) Hamza bin `Amr Al-Aslami asked the Prophet, "Should I fast while traveling?" The Prophet replied, "You may fast if you wish, and you may not fast if you wish."

The Prophet (saws) said: When one of you is fasting, he should break his fast with dates; but if he cannot get any, then (he should break his fast) with water, for water is purifying.

Fasting was observed on the day of 'Ashura' (i.e. 10th of Muharram) by the people of the Pre-lslamic Period. But when (the order of compulsory fasting) in the month of Ramadan was revealed, the Prophet said, "It is up to one to fast on it (i.e. day of 'Ashura') or not."