(8) It is not permitted to single out a Friday for fasting (al-Bukhaari, Fath al-Baari, no. 1985), or to fast on a Saturday, unless it is an obligatory fast (reported and classed as hasan by al-Tirmidhi, 3/111) – what is meant is singling it out without a reason. It is not permitted to fast for an entire lifetime, or to fast for two days or more without a break, i.e., to fast two or three days without a break in between.