Chapter on the Rules of Menstruation, Istihadah, and Nifas, and Purification From Them

Through this chain of narration, from Muhammad ibn Ya’qub, from Muhammad ibn Isma’il, from Al-Fadl ibn Shadhan, from Safwan ibn Yahya, from Abu Al-Hasan عليه السلام, who said: I said to Imam عليه السلام: "May I be sacrificed for you! If a woman sees blood for ten days, then it stops, and she remains pure for three days, but after that sees blood again, should she refrain from prayer?" Imam عليه السلام said: "No, she is in the state of istihadha (irregular bleeding). She must perform ghusl, insert a cotton pad, and combine two prayers with one ghusl. Her husband may approach her if he wishes."