middle ten days, or in the last ten. You may also fast one day out of every ten, or one day each week; all of this is permissible and the matter is broad. ʿĀʾishah (may Allah be pleased with her) said that the Prophet ﷺ did not mind whether he fasted those three days at the beginning, the middle, or the end of the month.

Still, the thirteenth, fourteenth, and fifteenth are preferable and more virtuous, for they are the “white days.”

Fasting on Thursday is likewise a Sunnah, though it ranks below fasting on Monday; Monday holds greater merit, yet both are praiseworthy.

Their excellence is due to what is reported from the Prophet ﷺ: “Deeds are presented to Allah on those two days, and I love that my deeds be presented while I am fasting.”

The finest form of fasting is the fast of David: a person fasts one day and breaks his fast the next—so long as he is able, does not suffer hardship, does not neglect other prescribed duties, and is not hindered from pursuing knowledge. There are other acts of worship, and if frequent fasting prevents you from them, then do not overdo your fasting.

Allah alone grants success.