Praise be to Allaah.

By His Wisdom, Allaah has prescribed that His slaves should voluntarily seek to draw closer to Him, after performing the obligatory acts of worship, by doing more of the same kinds of acts of worship, and He has assigned to that great rewards, as the Prophet (peace and blessings of Allaah be upon him) told us that his Lord said: “My slave does not draw near to Me with anything more beloved to Me than the religious duties I have enjoined upon him, and My slave continues to draw near to Me with supererogatory works so that I will love him, When I love him, I am his hearing with which he hears, he seeing with which he sees, his hand with which he strikes and his foot with which he walks. Were he to ask [something] of Me, I would surely give it to him, and were he to ask Me for refuge, I would surely grant him it.” (al-Bukhaari, 6502). 

Naafil fasts fall into two main categories: 

1 – General voluntary fasts (i.e., not restricted to any particular time or circumstances). The Muslim may observe a voluntary fast on any day of the year that he wishes, except those which are known to be forbidden, such as the two Eid days, on which fasting is haraam, and Ayaam al-Tashreeq (the three days following Eid al-Adha), on which fasting is haraam except on Hajj for those who do not have a hadiy (animal for sacrifice). Also excluded is deliberately singling out Friday for fasting, because it was reported that this is not allowed. One of the best forms of voluntary fasting is to fast alternate days for those who are able to do that, as it says in the hadeeth: “The most beloved prayer to Allaah is the prayer of Dawood (peace be upon him), and the most beloved fasting to Allaah is the fasting of Dawood. He used to sleep half the night, stand in prayer for one-third of the night, and sleep for one-sixth, and he used to fast alternate days.” (al-Bukhaari, 1131; Muslim, 1159). In order for this kind of fasting to be regarded as virtuous, it should not weaken a person and make him unable to do his primary duties, as it says in the hadeeth: “he used to fast alternate days, and he never ran away from battle (because he used to break his fast at times of jihad).” (al-Bukhaari, 1977; Muslim, 1159) 

2 – Specific voluntary fasts. These are superior to general voluntary fasts, and are of two types: 

The first type is fasts which are specific to a type of person, such as young men who cannot get married, as mentioned in the hadeeth of ‘Abd-Allaah ibn Mas’ood (may Allaah be pleased with him): “We were young men with the Prophet (peace and blessings of Allaah be upon him) and we did not have anything (i.e., we could not afford to get married). The Messenger of Allaah (peace and blessings of Allaah be upon him) said to us, ‘O young men, whoever among you can afford to get married, then let him do so, for it is more effective in lowering the gaze and guarding chastity. And whoever is not able to do that, then let him fast, for that will be a shield for him.’” (al-Bukhaari, 5066; Muslim, 1400). 

This kind of fasting is more emphasized so long as a person is single, and this prescription is more emphatic the more provocation there is. There is no mention of any specific number of days in this case. 

The second type is fasts prescribed at specific times, which vary, with some being weekly, some monthly and some annual. The weekly fasts are on Monday and Thursday, on which days fasting is mustahabb. It was narrated that ‘Aa’ishah said: “The Messenger of Allaah (peace and blessings of Allaah be upon him) was keen to fast on Mondays and Thursdays.” (al-Nasaa’i, 2320; classed as saheeh by al-Albaani in Saheeh al-Jaami’ al-Sagheer, 4827). The Prophet (peace and blessings of Allaah be upon him) was asked about fasting on Mondays and Thursdays, and he said: “Those are two days on which people’s deeds are shown to the Lord of the Worlds, and I want my deeds to be shown to Him when I am fasting.” (al-Nasaa’i, 2358; Ibn Maajah, 1740; Ahmad, 8161; classed as saheeh by al-Albaani in Saheeh al-Jaami’, 1583). He was asked about fasting on Mondays and he said, “On that day I was born and on that day revelation came to me.” (Muslim, 1162). 

With regard to the monthly fasts, it is mustahabb to fast on three days of each month. It was narrated that Abu Hurayrah (may Allaah be pleased with him) said: “My close friend [i.e., the Prophet (peace and blessings of Allaah be upon him)] advised me to do three things which I will never give up until I die: fasting three days each month, praying Duha, and sleeping after praying Witr.” (al-Bukhaari, 1178; Muslim, 721). It is mustahabb to observe this fast in the middle of the hijri month, on the days called Ayaam al-Beed. It was narrated that Abu Dharr said: “The Messenger of Allaah (peace and blessings of Allaah be upon him) said to me, ‘If you fast any part of the month then fast on the thirteenth, fourteenth and fifteenth.’” (al-Nasaa’i, 2424; Ibn Maajah, 1707; Ahmad, 210; classed as saheeh by al-Albaani in Saheeh al-Jaami’ al-Sagheer, 673). 

Annual fasts are observed on specific days, or during periods when it is Sunnah to fast. 

The specific days include the following: 

1-The day of ‘Aashoora’ which is the tenth of Muharram. It was narrated that Ibn ‘Abbaas (may Allaah be pleased with him) was asked about fasting on the day of ‘Aashoora’. He said, “I do not know of any day on the Messenger of Allaah (peace and blessings of Allaah be upon him) fasted that was better than this day and any month that was better than this month, meaning Ramadaan.” (al-Bukhaari, 2006; Muslim, 1132). It is Sunnah to fast the day before or the day after along with ‘Aashoora’, in order to be different from the Jews.

2-The day of ‘Arafaah, which is the ninth day of Dhu’l-Hijjah. It is mustahabb only for those who are not standing in ‘Arafaah itself, as the Messenger of Allaah (peace and blessings of Allaah be upon him) said concerning the virtue of the three fasts mentioned above: “The observance of three days' fast every month and that of Ramadan every year is equivalent to fasting for the entire year. I seek from Allah that fasting on the day of ‘Arafaah may atone for the sins of the preceding and the coming years, and I seek from Allah that fasting on the day of ‘Aashoora’ may atone for the sins of the preceding year.” (Muslim, 1162). 

The periods during which it is Sunnah to fast include the following: 

1-The month of Shawwaal. It is Sunnah to fast six days of Shawwaal, because the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever fasts Ramadaan then fasts six days of Shawwaal, it is as if he fasted for a lifetime.” (Muslim, 1164). See also Question no. 7859.

2-The month of Muharraam: it is Sunnah to fast whatever one can of this month, because of the hadeeth: “The best of fasting after Ramadaan is the month of Allaah Muharram, and the best of prayer after the obligatory prayers is prayer at night (qiyaam al-layl).” (Muslim, 1163).

3-The month of Sha’baan, as it was narrated that ‘Aa’ishah (may Allaah be pleased with her) said: “The Messenger of Allaah (peace and blessings of Allaah be upon him) used to fast until we thought that he would never break his fast, and he would not fast until we thought that he would never fast. I never saw the Messenger of Allaah (peace and blessings of Allaah be upon him) fast an entire month apart from Ramadaan, and the month in which I saw him fast the most was Sha’baan. He used to fast all of Sha’baan or all of it apart from a few days.”  (al-Bukhaari, 1969; Muslim, 1156). 

The Muslim who is keen to do good must realize the great virtue of performing voluntary fasts for the sake of Allaah, as it says in the hadeeth of the Prophet (peace and blessings of Allaah be upon him): “Whoever fasts one day for the sake of Allaah, Allaah will keep his face seventy years’ distance from Hell,” (al-Nasaa’i, 2247; classed as saheeh by al-Albaani in Saheeh Sunan al-Nasaa’i, 2121). 

We ask Allaah to make us among those whose faces He keeps far away from Hell and its heat, and to bless us with Paradise. 

With regard to the precise timing of Suhoor and Iftaar:

As mentioned in the definition of fasting, fasting means abstaining from food, drink and all other things that break the fast from dawn until sunset, as Allaah says (interpretation of the meaning): 

“and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night), then complete your Sawm (fast) till the nightfall”

[al-Baqarah 2:187]

So the fasting person must begin to abstain from things that break the fast when dawn begins and continue until the sun has set. The Messenger of Allaah (peace and blessings of Allaah be upon him) said concerning the time of iftaar: “When the night has come from here and the day has gone from here, and the sun has set, then let the fasting person break his fast.” (al-Bukhaari, 1818; Muslim, 1841). With regard to the time of suhoor, the majority of fuqaha’ said that it is the time from the last half of the night until the second dawn. It is Sunnah to delay it, according to the majority of scholars, so long as the second dawn has not begun, because of the verse quoted above and because the Prophet (peace and blessings of Allaah be upon him) said: “Hasten iftaar and delay suhoor.” (Narrated by al-Tabaraani and classed as saheeh by al-Albaani in Saheeh al-Jaami’, 3989). The purpose of suhoor is to give one strength to fast, so the closer it is to dawn the more effective it will be in helping one to fast. We ask Allaah to make us among those who adhere to His laws and act according to them. May Allaah send blessings and peace upon our Prophet Muhammad.