Rule: If days of bleeding that do not exceed 10 days are interrupted by days of purity, these days of purity in between are treated as if blood flowed during these days as well.

If the bleeding stops before 3 days are over, she waits until the end of the time of salat is quite close. Then making wudu (ablution) only without ghusl (purificatory bath) she performs the salat of that time and makes up those that she did not perform (during the bleeding). If bleeding reoccurs after she has performed that salat, she discontinues salat. If it stops again before 3 days are over, towards the end of the time of the salat she makes a wudu only and performs that salat and those that she did not perform, She acts likewise until the end of the 3rd day. If it stops after it has flowed for 3 days, she must resume salat by performing ghusl. If it recurs, she must discontinue salat.

Examples:

1. Supposing that a woman’s habit is 27 days of purity and 5 days of menstruation. If she, after remaining free from menstruation for 24 days, bleeds for 1 day and does not see blood for 2 days and bleeds for 2 days, 2 days of purity in between are treated as if there were a constant blood flow during these days. That is, she is considered to have seen bleeding for 5 days in total. Because these days of bleeding have not exceeded 10 days, she does not have to
refer to her previous menstrual period to ascertain whether these days of bleeding coincide with her previous menstrual period. The number of days during which she has seen bleeding becomes her new habit of menstruation. In other words, her norm becomes 24 days of purity and 5 days of menstruation.

2. Supposing that a woman’s habit is 22 days of purity and 6 days of menstruation. If she, after remaining free from menstruation for 21 days, bleeds for 3 days and does not see blood for 2 days and bleeds for 2 days, 2 days of purity in between are treated as if there were a constant blood flow during these days. That is, she is considered to have seen bleeding for 7 days in total. Because these days of bleeding have not exceeded 10 days, she does not have to refer to her previous menstrual period to ascertain whether these days of bleeding coincide with her previous menstrual period. The number of days during which she has seen bleeding becomes her new habit of menstruation. In other words, her norm becomes 21 days of purity and 7 days of menstruation.

3. Supposing that a woman’s habit is 23 days of purity and 7 days of menstruation. If she, after remaining free from menstruation for 21 days, bleeds for 1 day and does not see blood for 2 days and bleeds for 1 day and does not see blood for 3 days and then bleeds for 2 days, 2 days and 3 days of purity are treated as if there were a constant blood flow during these days. That is, she is considered to have seen bleeding for 9 days in total. Because these days of bleeding have not exceeded 10 days, she does not have to refer to her previous menstrual period to ascertain whether these days of bleeding coincide with her previous menstrual period. The number of days during which she has seen bleeding becomes her new habit of menstruation. In other words, her norm becomes 21 days of purity and 9 days of menstruation.

4. Supposing that a woman’s habit is 22 days of purity and 6 days of menstruation. If she, after remaining free from menstruation for 20 days, bleeds for 2 days and does not see blood for 6 days and bleeds for 2 days, 6 days of purity in between are treated as if there were a constant blood flow during these days. That is, she is considered to have seen bleeding for 10 days in total. Because these days of bleeding have not exceeded 10 days, she does not have to refer to her previous menstrual period to ascertain whether these days of bleeding coincide with her previous menstrual period. The number of days during which she has seen bleeding becomes her new habit of menstruation. In other words, her norm becomes 20 days of purity and 10 days of menstruation.

5. Supposing that a woman’s habit is 20 days of purity and 10 days of menstruation. If she, after remaining free from menstruation for 20 days, bleeds for 2 days and does not see blood for 2 days and bleeds for 2 days and does not see blood for 2 days and then bleeds for 2 days, 4 days of purity are treated as if there were a constant blood flow during these days. That is, she is considered to have seen bleeding for 10 days in total. Because these days of bleeding have not exceeded 10 days, she does not have to refer to her previous menstrual period to ascertain whether these days of bleeding coincide with her previous menstrual period. The number of days during which she has seen bleeding becomes her new habit of menstruation. In other words, her norm becomes 20 days of purity and 10 days of menstruation.