that she knows a time for herself, such as knowing that she used to menstruate on specific days within the first ten days of every month. In this case, she observes the number of her days from that time and not otherwise. Then, the number of her days must be either more than half of that time or not more. If it is more than half of it, such as if she knows that her menstruation is six days out of the first ten days of every month, we double the excess and designate it as menstruation with certainty, and she observes the remainder of her days through inquiry according to one of the two views, while in the other, she observes them from the beginning of the ten days. In this problem, the excess is one day, which is the sixth, so we double it, and the fifth and sixth days become menstruation with certainty, because whenever we count six days for her from any place within the ten, the fifth and sixth are included. Four days remain for her; if we have her observe them from the beginning, her menstruation is from the beginning of the ten days until the end of the sixth. Of these, two days are menstruation with certainty, four days are questionable menstruation, and the remaining four are questionable purity. If we have her observe them by inquiry, and her ijtihad leads her to believe they are from the beginning of the month, she is like the one we previously mentioned. If she observes the four from the end of the month, they are questionable menstruation, and the first four are questionable purity. If she says: "My menstruation is seven days from the first ten days," she has exceeded half of the time by two days, so we double them, resulting in four days of certain menstruation, which are from the beginning of the fourth until the end of the seventh. Three days remain for her, which she observes from the beginning of the first ten days (21) or by inquiry; this would be questionable menstruation, and three days would remain as questionable purity, while the rest of the month is purity. The ruling on questionable menstruation is the same as the ruling on certain menstruation regarding the abstention from acts of worship. If her menstruation is half of the time or less, she has no menstruation with certainty, because if she used to menstruate for five days, it is possible that they were the first five, or the second five, or that some were from the first and the rest from the second. Thus, she observes five days by inquiry, or from the beginning of the ten days, based on the two differing views.

Section: Repetition is not considered for the woman who has forgotten, because she knew her istihadah (irregular bleeding) in the first month, so there is no meaning in repetition.