From Ahmad ibn al-Hasan, from his father, from Tha‘labah ibn Maymun, from Ma‘mar ibn Yahya, from Dawud al-Zujaji: Abu Ja‘far عليه السلام said: "If a woman is in her menstrual period and becomes pure before sunset, she should perform the Dhuhr and 'Asr prayers. If she becomes pure at night, she should perform the Maghrib and the later 'Isha prayers."