The virtues of fasting are immense, and a number of saheeh ahaadeeth state this, such as the following:
Fasting is something which is just for Allaah, and Allaah will give multiple rewards without measure for it. The hadeeth says: “[Allaah says:] Fasting is Mine and it is I Who give reward for it.” (Al-Bukhaari, Fath, no. 1904)
“There is nothing equivalent to fasting.” (Al-Nisaa’i, 4/165; see also Saheeh al-Targheeb, 1/413)
“The prayer (du’aa’) of the fasting person will not be refused.” (Reported by al-Bayhaqi, 3/345; see also al-Silsilah al-Saheehah, 1797)
“The one who fasts has two joys: the joy of breaking his fast and, when he meets his Lord, the joy of having fasted.” (Reported by Muslim, 2/807)
Fasting will be an intercession for the slave on the Day of Resurrection, when it will say: “O Lord, I stopped him from eating and drinking during the day, so let me intercede for him.” (Reported by Ahmad, 2/174; al-Bayhaqi classed its isnaad as hasan in al-Mujtama’, 3/181; see also Saheeh al-Targheeb, 1/411).
“The smell (coming from the mouth of) the fasting person is better in the sight of Allaah than the scent of musk.” (Muslim, 2/808).
“Fasting is a protection and a strong fortress against the Fire.” (Reported by Ahmad, 2/402; see also Saheeh al-Targheeb, 1/411 and Saheeh al-Jaami’, 3880)
“Whoever fasts one day for the sake of Allaah, Allaah will keep his face seventy years’ distance away from the Fire because of it.” (Reported by Muslim, 2/808)
“Whoever fasts a day seeking the pleasure of Allaah and then dies [i.e. that is the last thing he does] will enter Paradise.” (Reported by Ahmad, 5/391; see also Saheeh al-Targheeb, 1/412)
“In Paradise there is a gate called al-Rayyaan, through which those who fast will enter, and no-one else will enter through it. After they have entered, it will be locked and no-one else will enter it.” (Al-Bukhaari, Fath, no. 1797).
Voluntary fasts will make up for any shortfall in obligatory fasts. Examples of voluntary fasts include ‘Aashooraa’, the Day of ‘Arafaah, al-Ayaam al-Beed (the “White Days”), Mondays and Thursdays, six days of Shawwaal, and increased fasting during the months of Muharram and Sha’baan.
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Islam Q&A
Sheikh Muhammed Salih Al-Munajjid