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4. A woman with a disordered habit (muḍṭaribah) → ← 2. A woman with a habit of time

3. A woman with a habit of duration

[Women with a habit of duration are of two types:]

1.
a woman whose duration of ḥayḍ is the same on two consecutive months but the time of her bleeding is not the same in each. In this case, her habit is considered to be however many days she experiences bleeding. For example, if in the first month she experiences bleeding from the first of the month to the fifth, and in the second month from the eleventh to the fifteenth, her habit will be five days.

2.
a woman who on two consecutive months experiences bleeding for three days or more, then her period stops for one or more days, and then she experiences bleeding again, and the time of bleeding in the first month differs from that of the second, such that all the days on which she experiences bleeding plus all the days on which her period stops in between do not exceed ten, and the number of days on which she experiences bleeding is the same. In this case, all the days on which she experiences bleeding is her habit of ḥayḍ, and on the days that her bleeding stops, she must, as a precautionary measure, do the things that are obligatory for a non-ḥāʾiḍ and refrain from doing the things that are unlawful for a ḥāʾiḍ. For example, if in the first month she experiences bleeding from the first to the third of the month, then her bleeding stops for two days, and then she experiences bleeding again for three days, and in the second month she experiences bleeding from the eleventh to the thirteenth, then her bleeding stops for two days, and then she experiences bleeding for three days, in such a case, her habit will be six days. However, if in one month, for example, she experiences bleeding for eight days and in the second month for four days, then her bleeding stops, and then she experiences bleeding again, and the total number of the days on which she experiences bleeding plus the days on which her bleeding stops in between is eight, then in this case, the woman does not have a habit of duration; rather, she is considered to be a muḍṭaribah (i.e. a woman with a disordered duration), the ruling for which will come later.

Ruling 482. If a woman with a habit of duration experiences bleeding for more or less than the number of days of her habit and it does not exceed ten days, she must consider it all to be ḥayḍ. If it exceeds ten days, then in the event that all the blood is similar, the days from the start of bleeding until the number of days of her habit is considered to be ḥayḍ and the rest istiḥāḍah. If all the bleeding is not the same, rather, on some days it has the attributes of ḥayḍ and on others the attributes of istiḥāḍah, and if the number of days on which it has the attributes of ḥayḍ is the same as the number of days of her habit, she must consider those days to be ḥayḍ and the rest istiḥāḍah. If the days on which the bleeding has the attributes of ḥayḍ are more than the days of her habit, then only the same number of days as her habit is ḥayḍ and the rest is istiḥāḍah. If the days on which the bleeding has the attributes of ḥayḍ are less than the days of her habit, she must consider those days with a few more days that together total the duration of her habit to be ḥayḍ and the rest istiḥāḍah.
4. A woman with a disordered habit (muḍṭaribah) → ← 2. A woman with a habit of time
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