Voluntary Fasting For The Pleasure Of Allah
Fasting in general and voluntary fasting, in particular, is great worship. Fasting is not restricted to Ramadhan, but it is an act of worship that can be [and should be in some cases] performed at any time and at any place except when not recommended. Indeed, it is a worship that draws the believer closer to Allah and closer to perfection.
Fasting Mondays and Thursdays:
`Aa’ishah said: The Messenger of Allah, salla Allahu alaihi wa salam, used to fast Mondays and Thursdays”. [An-Nasaa’i; Sahih]
Abu Hurairah reported that the most the Prophet, salla Allahu alaihi wa salam, would fast be Monday and Thursday. He was asked about that and he said: “The deeds of people are presented to Allah on every Monday and Thursday. Allah forgives every Muslim except for those who are deserting each other. He says: “leave them for later.” [Ahmad; Hasan]
Intention for voluntary fasting
As opposed to Ramadan, the intention does not have to be made before dawn. The person can intend fasting [and start fasting] after dawn any time [even after noon] given that he did not eat anything. `Aa’ishah said: The Prophet, salla Allahu alaihi wa sallam, came to us one day and said, “Do you have any [food]?” We said “No”. He said: Therefore, I am Fasting”. [Muslim and Abu Dawood]
Fasting three days of every month(White days):
Abu Tharr Al-Ghefari said: “The Messenger of Allah, salla Allahu alaihi wa sallam, said “O Abu Tharr! if you fast three days of every month, then fast the 13th, the 14th, and the 15th [these are called the al-ayaam al-beedh, the white days]”. [Ahmad, an-Nasaa’i and at-Tirmithi; Sahih]
“Fasting and the Qur’an will intercede for the slave on the Day of Resurrection. Fasting will say: ‘O My Rabb! I prevented him from food and desires, so accept my intercession for him.’ And the Qur’an will say: ‘I prevented him from sleep during the night, so accept my intercession for him.’ He (sallallahu `alayhi wa sallam) said: ‘And they will (be allowed to) intercede.’” [Ahmad, at-Tabarani, Al-Hakim, Sahih]
So let us get closer to Allah by fasting Mondays and Thursdays or at least 3 days every month on the 14th,15th, and 16th. If we leave something for the pleasure of Allah then we will get MUCH greater in return!