Abu Huraira reported God’s messenger as saying, “Men’s deeds are presented [to God] on Mondays and Thursdays, and I like mine to be presented when I am fasting.”
Tirmidhi transmitted it.
Abu Dharr reported God’s messenger as saying, “When you fast three days in the month, Abu Dharr, fast on the thirteenth, fourteenth and fifteenth.”
Tirmidhi and Nasa'i transmitted it.
‘Abdallah b. Mas'ud said that God’s messenger used to fast the first three days every month, and he would seldom break his fast on a Friday.
Tirmidhi and Nasa’i transmitted it, and Abu Dawud transmitted up to “three days…
‘A'isha said that God’s messenger used to fast on Saturday, Sunday, and Monday one month, and on Tuesday, Wednesday, and Thursday the next.
Tirmidhi transmitted it.
Umm Salama said that God’s messenger used to command her to fast three days every month beginning with Monday or Thursday.
Abu Dawud and Nasa’i transmitted it.
Muslim al-Qurashi said that he or someone else asked God's messenger about perpetual fasting, and he replied, “You have a duty to your family. Fast during Ramadan and the following month, and every Wednesday and Thursday…
‘Abdallah b. Busr, on the authority of his sister as-Samma’, reported God’s messenger as saying, “Do not fast on Saturday except during what has been made obligatory for you; and if one of you can get nothing but a grape…
Abu Umama reported God’s messenger as saying, "If anyone fasts for a day while on jihad,* God will put between him and hell a ditch as wide as the distance between heaven and earth."
*Mirqat gives this meaning, but says…
‘Amir b. Mas'ud reported God’s messenger as saying, “Fasting in winter is booty gained without trouble.”*
*Literally, 'the cold booty.' The idea is that in winter one does not suffer from hunger and thirst as in summer.…
The tradition of Abu Huraira, “No days are dearer to God”, has been mentioned in the chapter on the sacrifices.*
*Reference to the first ten days of the month of Dhul Hijjah.