Is it forbidden to single out Friday and Saturday for fasting, and what is the wisdom behind that? What is the ruling if the first of Ramadan falls on a Saturday? Is the fast valid if the fasting person breaks their fast based on a mobile phone adhan which was later confirmed to have been before the actual adhan?

The prohibition against singling out Saturday or Friday for fasting has been reported. This prohibition indicates karāhah (dislike/disapprobation) and not taḥrīm (prohibition) according to the majority of scholars. This karāhah is removed if one fasts a day before or a day after it.

The reason for the karāhah of singling out Friday for fasting: It weakens the fasting person from performing religious acts on Friday, such as prayer and supplication. The reason for the karāhah of singling out Saturday for fasting: It is a day venerated by the Jews, so singling it out involves imitating them.

The prohibition does not include: 1. Fasting both days together (Friday and Saturday). 2. Fasting an obligatory fast (such as fasting Ramadan if it falls on a Friday or Saturday).

Whoever intends good and does what he can of it, but is unable to complete it, will receive the reward of one who completed it.