Ibn `Abbas (may Allah be pleased with them both) said: “I never saw Allah’s Messenger (peace and blessings be upon him) so keen to fast any day and give it priority over any other than this day, the day of `Ashura’, and this month, meaning Ramadan.” (Al-Bukhari, Hadith 1867) In another hadith we are told that fasting the day of `Ashura’ expiates the sins of the previous year as the Prophet (peace and blessings be upon him) said, “Fasting the day of `Ashura’ (is of great merits), I hope that Allah will accept it as anexpiation for (the sins committed in) the previous year”(Muslim).
Fasting the Day of `Ashura’ is not to mourn the martyrdom of imam Husain (may Allah be pleased with him). We deeply respect Imam Husain’s martyrdom, we honor his glorious act of sacrifice for the sake of Islam. He gave us a great example of truth, courage and piety. But we also feel pain and grief in our hearts for his assassination at the hand of some hypocrites who took Islam as a pretext to commit their crime. They fought and killed Allah’s Messenger’s beloved and blessed grandson and his family. This was the most heinous and shameful crime that was committed for the sake of political power. This tragic event took place in the year 61 AH or 680 CE. However, the tradition of `Ashura’ fasting is very ancient and it goes back to a long time before imam Husian.
It is reported in the Sahih of Imam Al-Bukhari and other authentic collections of hadith that the Prophet (peace and blessings be upon him) and his Companions used to fast on the 10th day of Muharram while they were in Makkah (before the hijrah).
It was a day on which people of Makkah used to change the covering (kiswah) of the Ka`bah. Quraysh also used to fast on this day. (Al-Bukhari, hadith 1489 and 1760)
After the hijrah when the Prophet (peace and blessings be upon him) came to Madinah, he found that the Jews of Madinah also used to observe this day with fasting. The Prophet (peace and blessings be upon him) asked them the reason of their fasting on this day. They said, “This is a blessed day. On this day Allah saved the Children of Israel from their enemy (in Egypt) and so Prophet Musa fasted on this day giving thanks to Allah.” The Prophet (peace and blessings be upon him) said, “We have more claim to Musa than you.” He fasted on that day and commanded Muslims to fast on this day. (Al-Bukhari, hadith 1865)
In another report it is mentioned that Jews of Madinah used to hold a feast on this day. The Prophet (peace and blessings be upon him) told his Companions to fast instead. (Al-Bukhari, hadith 1866)
`Ashura’ fasting was obligatory (fard) in the beginning. In the second year of hijrah (624 CE) when Allah’s command came that Muslims should fast the whole month of Ramadan, the Prophet (peace and blessings be upon him) then sent someone to announce to people that fasting of `Ashura’ had become voluntary (nafl). This indicates that whosoever wishes to fast, may fast and whosoever does not want to fast, there will be no blame on him/her.
Imam At-Tirmidhi mentioned that ibn `Abbas (may Allah be pleased with them both) used to say that we should fast on two days: the 9th and 10th of Muharram to distinguish ourselves from the Jewish community. (At-Tirmidhi)
Ibn`Abbas also quoted the Prophet (peace and blessings be upon him) as saying, “If I live next year, I shall also fast on the 9th day.” (MusnadAhmad ibnHanbal, hadith2002)
There is a great reward in fasting the day of `Ashura’. There are many hadiths that mention its blessings and virtues. It is good to fast on this day, although it is not obligatory.
Abu Hurayrah reported: “I asked the Prophet: ‘Which Prayer is the best after the obligatory Prayers?’ He said: ‘Prayer during the mid of the night.’ I asked: ‘Which fasting is the best after that of Ramadan?’ He said, ‘The month of Allah that you call Muharram’” (Ahmad, Muslim, and Abu Dawud).
Mu`awiyyah ibn Abi Sufyan reported that he heard the Messenger of Allah say: “Concerning the day of `Ashura’, it is not obligatory upon you to fast on it as I do. Whoever wishes may fast and whoever does not wish to is not obliged to do so” (Al-Bukhari and Muslim).
It is note worthy that Muslim scholars have stated that fasting of `Ashura’ is of three levels as follows:
1. fasting for three days, i.e., on the 9th, 10th, and 11th of Muharram,
2. fasting the 9th and 10th of Muharram, and
3. fasting only the 10th of Muharram.