On the Mysteries of Fasting
Know that fasting is of three grades, namely, the fasting of the general public (ṣawm al-ʻumūm), the fasting of the select few (ṣawm al-khuṣūṣ), and the fasting of the elite among the select few (ṣawm khuṣūṣ al-khuṣūṣ). The fasting of the general public involves refraining from satisfying the appetite of the stomach and the appetite of the sex, as has already been discussed.