The Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, said: "As for the mustahadah (a woman experiencing irregular bleeding), she is the one who sees thin, cold, clear blood outside the days of her menstruation." The characteristics of the mustahadah's blood were already mentioned at the beginning of the chapter. He, Shaykh (Al-Mufid), further explained: "She must wash her private area, insert cotton, and secure it with cloth to prevent the cotton from slipping out. If the bleeding is minimal, does not soak the cloth, and remains within, she must remove the cotton at the time of each prayer, cleanse herself (istinja), replace the cotton and cloth, and perform wudu for the prayer. If the blood soaks the cloth lightly but does not flow out, she must cleanse herself, replace the cotton and cloth for the Fajr prayer, perform wudu, and also perform ghusl after wudu for this prayer. For subsequent prayers, she only needs to replace the cotton and cloth, cleanse herself, and renew wudu without repeating ghusl. If the blood is heavy, soaking the cloth and flowing out, she must delay Dhuhr prayer from its early time, remove the cloth and cotton, cleanse herself with water, insert fresh cotton and clean cloth, perform wudu, then perform ghusl. She should then pray Dhuhr and Asr together in one state of purification. She should follow the same process for Maghrib and Isha prayers, delaying Maghrib until just before sunset and performing Isha at its earliest time. She should also follow the same process for the night and Fajr prayers. If she skips the night prayers, she should follow this process for Fajr. If she performs wudu and ghusl as described, it becomes permissible for her husband to approach her. However, it is not permissible for him until she does what was described: removing the cloth, washing her private area, and preparing herself with purification. The mustahadah does not abandon fasting or prayer during her state of irregular bleeding. However, she does not fast or pray on the days she would normally experience menstruation before her condition changed due to istihada." This is supported by (following hadith):
Commentary #21