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.

Ibn Abbas explained the following Qur'anic verse: "O ye who believe! fasting is prescribed for you as it was prescribed for those before you" During the lifetime of the Prophet (saws), when the people offered night prayer, they were asked to abstain from food and drink and (intercourse with) women, they kept fast till the next night. A man betrayed himself and had intercourse with his wife after he had offered the night prayer, and he did not break his fast. So Allah, the Exalted, intended to make it (fasting) easy for those who survived, thus providing a concession and utility. Allah, the Glorified, said: "Allah knoweth what ye used to do secretly among yourselves." By this Allah benefited the people and provided concession and ease to them.

The Prophet observed the fast on the 10th of Muharram ('Ashura), and ordered (Muslims) to fast on that day, but when the fasting of the month of Ramadan was prescribed, the fasting of the 'Ashura' was abandoned. `Abdullah did not use to fast on that day unless it coincided with his routine fasting by chance.

It was rarely that the Messenger of Allah (saws) set out on a journey on any day but on a Thursday.

that he had heard Hudhaifa saying, "Once I was sitting with `Umar and he said, 'Who amongst you remembers the statement of Allah's Apostle about the afflictions?' I said, 'I know it as the Prophet had said it.' `Umar said, 'No doubt you are bold.' I said, 'The afflictions caused for a man by his wife, money, children and neighbor are expiated by his prayers, fasting, charity and by enjoining (what is good) and forbidding (what is evil).' `Umar said, 'I did not mean that but I asked about that affliction which will spread like the waves of the sea.' I (Hudhaifa) said, 'O leader of the faithful believers! You need not be afraid of it as there is a closed door between you and it.' `Umar asked, Will the door be broken or opened?' I replied, 'It will be broken.' `Umar said, 'Then it will never be closed again.' I was asked whether `Umar knew that door. I replied that he knew it as one knows that there will be night before the tomorrow morning. I narrated a Hadith that was free from any misstatement" The subnarrator added that they deputized Masruq to ask Hudhaifa (about the door). Hudhaifa said, "The door was `Umar himself."

Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, made the zakat of breaking the fast at the end of Ramadan obligatory on every muslim, whether freeman or slave, male or female, and stipulated it as a sa' of dates or a sa' of barley.

While the Muslims were offering the Fajr prayer on Monday and Abu Bakr was leading them in prayer, suddenly Allah's Apostle lifted the curtain of `Aisha's dwelling and looked at them while they were in the rows of the prayers and smiled. Abu Bakr retreated to join the row, thinking that Allah's Apostle wanted to come out for the prayer. The Muslims were about to be put to trial in their prayer (i.e. were about to give up praying) because of being overjoyed at seeing Allah's Apostle. But Allah's Apostle beckoned them with his hand to complete their prayer and then entered the dwelling and let fall the curtain.

(The tribe of) Quraish used to fast on the day of Ashura' in the Pre-Islamic period, and then Allah's Apostle ordered (Muslims) to fast on it till the fasting in the month of Ramadan was prescribed; whereupon the Prophet said, "He who wants to fast (on 'Ashura') may fast, and he who does not want to fast may not fast."

During the Pre-lslamic Period of ignorance the Quraish used to observe fasting on the day of 'Ashura', and the Prophet himself used to observe fasting on it too. But when he came to Medina, he fasted on that day and ordered the Muslims to fast on it. When (the order of compulsory fasting in ) Ramadan was revealed, fasting in Ramadan became an obligation, and fasting on 'Ashura' was given up, and who ever wished to fast (on it) did so, and whoever did not wish to fast on it, did not fast.

'Ashura' (i.e. the tenth of Muharram) was a day on which the tribe of Quraish used to fast in the prelslamic period of ignorance. The Prophet also used to fast on this day. So when he migrated to Medina, he fasted on it and ordered (the Muslims) to fast on it. When the fasting of Ramadan was enjoined, it became optional for the people to fast or not to fast on the day of Ashura.

While the Prophet was distributing (war booty etc.) one day, Dhul Khawaisira, a man from the tribe of Bani Tamim, said, "O Allah's Apostle! Act justly." The Prophets said, "Woe to you! Who else would act justly if I did not act justly?" `Umar said (to the Prophet ), "Allow me to chop his neck off." The Prophet said, "No, for he has companions (who are apparently so pious that) if anyone of (you compares his prayer with) their prayer, he will consider his prayer inferior to theirs, and similarly his fasting inferior to theirs, but they will desert Islam (go out of religion) as an arrow goes through the victim's body (games etc.) in which case if its Nasl is examined nothing will be seen thereon, and if its Nady is examined, nothing will be seen thereon, and if its Qudhadh is examined, nothing will be seen thereon, for the arrow has gone out too fast even for the excretions and blood to smear over it. Such people will come out at the time of difference among the (Muslim) people and the sign by which they will be recognized, will be a man whose one of the two hands will look like the breast of a woman or a lump of flesh moving loosely." Abu Sa`id added, "I testify that I heard that from the Prophet and also testify that I was with `Ali when `Ali fought against those people. The man described by the Prophet was searched for among the killed, and was found, and he was exactly as the Prophet had described him." (See Hadith No. 807, Vol. 4)