Ali ibn al-Hasan narrated from Muhammad and Ahmad, the sons of al-Hasan, from their father, from Abdullah ibn Bukayr: It was said regarding a young girl who experiences menstruation for the first time and blood continues to flow, making her in a state of istihadah (irregular bleeding), she should wait for the prayer and not perform it until the maximum duration of menstruation, which is ten days, has passed. After this period, she should follow the practices of a woman in istihadah and then resume her prayers. For the rest of the month, she continues to pray. In the second cycle, she stops praying for the minimum period of menstruation, which is three days. If her bleeding persists, she should pray during the time of prayer she previously prayed and consider the maximum period of purity and the minimum period of menstruation as her time for observing prayers and refraining from them.