Narrated from Muhammad ibn Abdullah ibn Zurara, from Muhammad ibn Abi Umayr, from Umar ibn Udhaynah, from Fudayl and Zurara, from one of the Imams عليه السلام: The Imam عليه السلام said: "A woman in a state of istihadah (irregular bleeding) refrains from prayer during her menstrual days and then adds a precautionary period of one or two days. After that, she must perform ghusl (ritual purification) three times every day and night. She should use a cloth to prevent blood flow for the Fajr prayer, perform ghusl, and then combine Dhuhr and Asr prayers with one ghusl, and Maghrib and Isha prayers with another ghusl. Once she is permitted to perform prayer, it also becomes permissible for her husband to have intercourse with her."