What is the ruling on blood that appears after dryness or intermittent purity during the usual menstrual period, and that continues for more than fifteen days, bearing in mind that the period is regular at its beginning?

As long as the total number of days of bleeding, both continuous and intermittent, does not exceed fifteen days, the woman is not considered to have istiḥāḍah (non-menstrual bleeding), and her menstrual pattern changes. Jurists differ regarding the ruling on the days when the bleeding stops:

- The Shafi'i and Hanafi schools of thought: They consider these days as part of menstruation, thus prayer and fasting are not permitted during them.

- The Maliki and Hanbali schools of thought: They consider these days as a period of purity (ṭuhur), during which prayer and fasting are obligatory, and what is prohibited for a menstruating woman becomes permissible. Furthermore, anyone who did not pray during these days must make up for those prayers.

This applies if the cessation of bleeding is complete. However, if there is still blood present, even if only a slight trace, these days are considered menstruation.