Chapter on Menstruation, Istihada (abnormal bleeding), and Nifas (postpartum bleeding)

Ali ibn Al-Hasan narrated from Muhammad ibn Al-Rabi’, from Saif ibn Amira, from Mansur ibn Hazim, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: "If a menstruating woman attains purity before the time of ‘Asr, she should perform both the Dhuhr and ‘Asr prayers. However, if she attains purity at the end of the time for ‘Asr, she should perform only the ‘Asr prayer."